LMFAO
"lmfao" is a 5-letter English headword indexed on PlainSpell.
The verdict
“LMFAO” is a moderately-common English word, ranked #18,358 in English word frequency and used as an interjection.
- #18,358
- frequency rank, English
- 5
- letters
- 7
- tracked misspellings
- 3
- confusable pairs
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Initialism of laughing my fucking ass (arse) off More emphatic form of LMAO.
Visual similarity to commonly confused words
How many letter changes separate each confused pair (Levenshtein distance, normalized).
Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).
| Property | Value |
|---|---|
| Headword | LMFAO |
| Language | English |
| Part of speech | Interjection |
| Letters | 5 |
| Frequency rank | #18,358 |
| Misspellings tracked | 7 |
| Confusable pairs | 3 |
| Source | Wiktionary (kaikki.org) |
Where “LMFAO” sits in English frequency
Spelling & Dictionary Insight
The English entry for LMFAO is 5 letters long, classified as an interjection. Corpus data places it at rank #18,358 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. The dominant gloss from Wiktionary reads: "Initialism of laughing my fucking ass (arse) off More emphatic form of LMAO.".
Our generated misspelling index lists 7 likely wrong-spelling variants for LMFAO, with forms such as "lfmao", "llmfao", and "lmafo". Each variant is a distinct typo pattern an edit-distance generator flags, typically a doubled-consonant error, a silent-letter drop, or a vowel substitution. It also participates in 3 confusable-pair relationships, "Lao", "LMAO", "liao", a pairing that trips writers up because the two words share enough sound or shape to blur together.
Etymologically, the entry records: LMAO with an additional F meaning fucking. The correct English form is LMFAO, spelled L-M-F-A-O.
Definition
- 1Initialism of laughing my fucking ass (arse) off More emphatic form of LMAO.
Etymology
LMAO with an additional F meaning fucking.
Common misspellings
Also misspelled as: lfmao,llmfao,lmafo,lmffao,lmfoa,lmmfao,mlfao
Misspelling Pattern Breakdown
How far each generated variant is from the correct spelling of LMFAO - measured in single-character edits (insert, delete, or substitute a letter). Larger bars are easier to catch; one-edit slips are the sneakiest.
Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.
Frequently Asked Questions
How do you spell "LMFAO"?
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Using “LMFAO”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is L-M-F-A-O - every other letter order is a misspelling in standard orthography.
- Don't mix it up with “Lao” - see the side-by-side comparison. LMFAO vs Lao
- Browse more English words and confusable pairs in the same reference. English words
Data Source
Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.