(Primarily British)
A line that forms around ones buttocks and thighs after lengthy spells on the loo due to pressure against the toilet seat.
Adam: Steve. Will you still butt fuck me even if I have loo bite, or should I massage it off with some cream first?

Steve: Loo bite, shmoo bite! Hand me the condoms and lube!
by BimbaKimbo October 22, 2007
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