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1.
(noun.)

A particularly unattractive woman who is following, walking behind, or last in a group of much more attractive women.
Joey: Whoa! That chick is hot!
Ramone: Man, and so is that girl!
Joey: Damn! Check out her friend...
Ramone: Ugh... that last one though... She looks rough... what a boo caboose.
by Tiger's Other Other Other Girl January 15, 2010