Top Definition
Mutual oral sex with four participants. One participant must be considerably taller than the others to obtain the correct shape. Works best with four guys.
Sam: Hey Josh! Wanna form a trapezium with me Jonny and Joe tonight?
Josh: Yeah sure!
by TheGoonMeisterFnar March 26, 2014

The Urban Dictionary Mug

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

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The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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