when a man sticks his dick into a agirls ass and ejaculates, then the sperm trickles down to the vagina and up it to make a baby.
bill is a trickle baby.
by daywalker October 10, 2003
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when a guy finishes in a girls a** and the cum trickles down into her vagina causing her to get pregnant from it

can also be used on people who bother you
my mom told me my brother was a booty trickle baby

god that guys is a real booty trickle baby for that
by rina😼 May 16, 2022
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