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Abbreviation: \ˈbiŋ-sē\ Because It's Not Going To Suck Itself. Most commonly used when explaining one's reason(s) for doing a particular activity, esp. when the person asking just doesn't get it.
"Dude, why do you spend so much time in the gym?"
"BINGTSI."

See also: blow job, fellatio, head
by Cloclia July 19, 2015
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