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1.
A cute nickname for a bf/gf, best friend, etc.

but can also be used as an insulting term.
Ex. 1:

Erica: I love you babe.
Don: I love you too, suckerbutt.

Ex. 2:
Guy 1: Go die you asshole.
Guy 2: That hurt my feelings.
Guy 1: I was joking, stop being such a suckerbutt.
by badlittlebaby January 31, 2011