What is River Pump?
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The act, or effect, of exercising (push ups etc.) just before embarking on an intertube trip down the river. This temporarily enlarges your muscles, with the desired result being a more impressive appearance to the opposite sex.
Instead of tying up the raft he was on the bank working on his river pump.
See
Random Words:
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up the bottom (like what gay men do)
That man has his winky up that other mans windward passage! Let's call this act "going u..
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but chuck norris can
e.g.
randome1: i cant belive its not butter
randome2: chuck norris can
randome1: no dude just no
randome2:wat..