When a man puts pop-rocks inside a woman's vagina and then proceeds to have sex with her, delivering a pleasurable sensation to both member's genitals. The term is derived from the "49ers" who prospected rocks in San Francisco in 1849.
Man 1: Check out the freak over there--I bet she's down to do the weird stuff.
Man 2: Dude, she's totally DT49.
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