A phrase used on Internet forums to counter the vast range of unverifiable claims made by users. Often these claims involve personal brag-worthy accomplishments, extraordinary or rare sights/occurrences, and tales relating to alcohol or drug use.
Guy 1: Dude, I drank four bottles of bourbon last night, then hooked up with 4 chicks at the same time, then Donald Trump came to my house and gave me a million dollars!
Guy 2: Pics or it didn't happen.
by The Patriarch March 29, 2006
A phrase used primarily on online forums stating that the person refuses to believe the thread creator's claim unless it is shown by a photograph for proof.
I got 73 kills in a single game on Call of Duty 4 and it wasn't even on Shipment.

Reply: Pics or it didn't happen.
by Nicholas Weiner May 11, 2008
What 12 year old horny boys say when they want a picture of a hot girl
Person 1: me and my sis got in this huge vodka spitting contest, her shirt was so fucking soaked you could see her boobs

12 year old: pics or it didn't happen
by just a random british girl October 13, 2016
A demand for someone to show photographic evidence of a bizarre claim, or you don't believe it
John, you said you fucked 3 girls last night, I don't believe you, you virgin fuck. Pics or it didn't happen.
by ThatGuyWhoLikesTSeries June 7, 2019
Pics or it didn't happen is used when someone makes a very far fetched statement about something. See example.
Teenager1: So brah ask me what I did over the weekend
Teenager2: ok....what did you do over the weekend?
Teenager1: I went over to this girls house and I fucked her and then her mom walked in on us and we had a threesome.
Teenager2: Pics or it didn't happen looser!
by omg45439934 August 23, 2009
A statement made by an individual when someone tells a story they believe is false. They request photographic evidence to prove it actually happened.
Laura: Why were you late?

Casey: Sorry. I got in a car crash. Front bumper and headlight got slaughtered. Had to call an Uber to get here.

Laura: Pics or it didn't happen.

Casey: *shows pictures of his wrecked car*

Laura: Sorry, these are clearly fake
by KnightofNerdom April 23, 2019
Figure of speech, sarcasm. Used when someone has described something so vividly that you really don't need to see pictures to fully understand.
That guy just spewed his supper all over the sidewalk. Looks like he ate hot dogs and Fritos, and maybe had some sort of grape soda to drink...

Ewww, gross! Pics or it didn't happen!
by Hemenucha March 8, 2009