Choompie

Acting out of character, looking foolish

sad ass ninja, Yo you seen that hipster at the rave he was a choompie.

So Madona let me smash once then when I seen her at the grammys she was acting like a real choompie.

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Choompy

Goofball/Retard/Fuckup, but in a joking way. Choomp for short which is mostly used in a more insulting way.

Person1: "HA, you actually dialed Pizza Hut while having sex? You're such a fuckin choompy."
Person2: "At least I can actually get laid you virgin choompy."

Guy1: "You're such a fuckin choomp stfu, get outta here."
Guy2: "Ayo fuck you too bitch"