Top Definition
When everything is going along all cool then your buddy starts to act like a totally bitch out of blue like some girl on the rag.
Friend 1: Hey I thought Bob was comin out with us tonight.

Friend 2: I talked to him earlier and he had somethin stuck up his ass. I'm pretty sure he's fourth-weekin.
by The Maelstrom June 01, 2009
5 Words related to fourth-weekin

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