What is River Pump?
1.
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.
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1.
When your friend is visibly too drunk to be allowed into a club by a bouncer, you 'prop' him or her up, put their ID in their ..