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Your boo, your girlfriend/boyfriend. Derived from the tagalog word for flower (bulaklak) it is used as a term of endearment but also can be used in lewd terms.
"The boo lack lack has me on lock down, I can't go to the strip club."

In lewd terms:
"Ay gurl, let me get all up that Boo lack lack."

"So I walk into the restroom and I hear these 2 people boo lack lackin in the stall."
by cjaysez March 02, 2011
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