The undesired reception of intimate bodily contact, typically in the pubic region, ranging from uninvited cunnilingus (Shushing gesture optional), to the fondling of the male genitalia. "Flach'ing" is usually associated, but not limited to, the ingestion of mind altering substances.
Lam: "How was the tent last night?"

Jeremy Fisher: "It was like a horror movie in there, I totally got flach'd!"
by realbillclinton August 12, 2014
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