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"Let me fix that for you."

Used on internet forums when one takes it upon oneself to edit or correct somebody's words/images/material/whatever, usually with comical results.
Guy: Hey man, look at this cool Ed Hardy hat I bought!
Other guy: lmftfy... "Hey man, look at this douchebag hat I wasted my money on! I'm gonna wear it while I f*** my cousin!"
lmftfy by Mr. Moons April 19, 2013
Related Words
LMFDF lmfdo lmffo LMDFAO lmfafo LMFBFO lmfdao Lmfdobiaam LMFFAO LMDF
The new text buzz word for fitness gurus
Meaning - Laughing my fucking body fat off
Text convo:
Person1 - Hey did you know shadman forgot his bait in the freezer?
Fitness guru - LMFBFO. I guess the only thing he will be catching is a cold
Person1 - Lolski
LMFBFO by Alfinator December 19, 2011
Laugh my fucking dick off.
Used in really any case where your friend or enemy or pet turtle texts you something funny.

Should not be used in cases where the person will blackmail you for laughing at what they said. Shown in example #2.
1)While texting:

Person 1: "Damn she looks mad ratchet"
Person 2: "Lmfdo! Dude you're hilarious, that's so true though..."

2)

Person 1: "She looks like she gained some weight, poor girl. I heard she caught herpes too, shortly after her mother was killed in that car accident yesterday."
Person 2: "Lmfdo! Sucks to suck."
Person 1: "You're an asshole! We're no longer friends! I'm telling the whole school about how you're an ass-licking mother fucking gay rhino-raping fat piece of vanilla flavored shit in a dumpster full of fat rats drinking kool-aid riding unicycles while singing random justin bieber songs.... No nipple having bitch!!!"
Lmfdo by Little Bit of Luck January 8, 2013
In a chatroom-

Person A: insert hilarity here
Person B: lmfafo
lmfafo by Subriox December 28, 2006
Another term of saying LMFAO but you're laughing so hard that you can't finish writing it out.
Josh: Jorge did you hear about Alinity throwing her cat
Jorge: LMFF yea she's a dumbass
LMFF by ohyuh August 1, 2019

lmffaoomgialmfaoshrn 

Laughing my fat fucking arse off. Oh my god, I am laughing my fat arse off so hard right now!
What a funny joke you just made. Lmffaoomgialmfaoshrn.
lmffaoomgialmfaoshrn by Rest Synth February 7, 2020