A gumbus is term used when interacting with a person who's bodily structure resembles that of a toadstool. Gumbus can also be used when referring to somebody that can be seen as bearing a suspicious or odd nature.
Chad 1: What's up gumbus?
Nerd 1: Stop calling me that ...
Chad 2: whatcha doin in there gumbus?
Nerd 2: Uhh nothing! Stay out!
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A period of time where nothing seems to be going your way (badly)
Dude 1: Dude!!!! You just failed like half your classes, your girl broke up with you, and youâre being on rent???
Dude 2: Yeah, Iâm in my flop era.