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to sleep in the same bed with someone (not just in the same room).

British usage.
Although Sam only has a single bed, he lusts to bunk up with seb every night.

When Tom met that hot piece, they hooked up, went boozing, and decided to bunk up all weekend.
bunk up by stsebastian November 29, 2009
You couldn't get a bunk up in Bangkok mate!
bunk up by Robbo_69 May 20, 2008
to assist a climber by pushing him/her upwards
"'ere Stephen, g'is a bunk up, I'm nearly over this wall."
bunk up by theWestHamfan October 27, 2003
To bend over. Show your butt. Told to a child in preparation for a spanking.
Bunk up Chile! You need a good beeatin’!
Bunk up by Fleshaxxe July 24, 2018

Bunk up my(/the) steez 

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)

bunkup badge 

A hicky received during sexual intercourse. Synonym of shag tag and fuck suck.
That's a huge bunkup badge on your neck Dan - what are you feeding your girlfriend?
bunkup badge by Dan Fox June 30, 2003