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A lovey-dovey way to say the person you're with is the final ass-kiss at the end of your train wreck of a relationship. Baby and caboose merged into one sad, sweet disaster called baboose.
I’m gonna marry this baboose and live happily ever after... or at least until he forgets to pay the rent.
She’s my baboose, my last stop, my final sigh before I die.
He said I was his baboose. I said I’d be his baboose until he stopped acting like a baboon.