A sexual encounter involving tires. Similar to a threesome, but with tires.
Justin is chaffed and covered in friction burns from an erotic tiresome last evening.
by Phil Korn November 05, 2010
Something that is so crazy or so hard that it makes you really tired.
Henry: Damn that party was tiresome last night.

Katie: I know. I woke up at noon after getting so hyper and crashing
by Henry (edumacated) November 23, 2008

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