Several words tethered together loosely to form a phrase, coined by the very definition writing creature of whom is writing right now, Sorbet/Sobek/whateverthehjonk.

The individual meanings are as follows:

Bunk up”, similar to fuck up, but slightly lighter

“Steez”, either something to do with personal style, or a vibe you got goin’ from something.

Collectively these words of which coalesce into a phrase form the aforementioned, which in whole means to throw off a vibe/resonating frequency, or to otherwise “cramp on one’s style”.
Jeff: Man, Discord crashing bunked up the steez real good.

talking moose (named Kyle): Jeff what the hell does that even mean are you okay.

(Bunk up my(/the) steez)
by Doctor Sobek June 21, 2022
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