Usually said after someone makes a statement about something and you're looking for proof.
15:39:34 <%iRyan> "big tits" hahaa
15:39:46 <@Kevin|Zelda> i got em
15:39:57 <%iRyan> NO PIC NO PROOF
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Not having the proof to back up any statement said. Can be used in any situation where someone is or is not boosting.
Jim: Bro! Stacy and I did the funky money lastnight!
Tim: No boost bro?! Got pics?
Jim: No...
Tim: No pics no proof bro.