Log Flume
The process of pooping on a girl's back, more towards the shoulder blades, and then pissing it down towards her ass. Resembles a log flume ride.
Keith: Yo, i just log flumed this girl last night.
Dan: o yeah, howd it go?
Keith: She loves that shit.
Dan: o yeah, howd it go?
Keith: She loves that shit.
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