Top Definition
compound word- "instantly"-"flaccid"

Seeing something so completely grotesque that your erection instantly wither's and dies.
person 1: "I thought id rub an easy one out last night. went to redtube and clicked a random video, skipped to the middle and realised it was gay-porn. instiflas."
person 2: "DUDE!?! why are you telling me this? but yes, the same thing happend to me the other day."
by pokoi August 07, 2009
5 Words related to Instiflas

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