3
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.
by stsebastian November 28, 2009
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4
to assist a climber by pushing him/her upwards
"'ere Stephen, g'is a bunk up, I'm nearly over this wall."
by theWestHamfan October 27, 2003
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5
To bend over. Show your butt. Told to a child in preparation for a spanking.
Bunk up Chile! You need a good beeatin’!
by Fleshaxxe July 24, 2018
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