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Cave flooding involves urinating into your partner's anus or vagina during the act of sexual copulation. Considered to be one of the most romantic surprises you can give to your sexual partner.
JIMMY: Last night Frank was so wasted whilst screwing his girlfriend that he forgot what he was doing and he flooded her cave.

JOHNNY: That's no surprise, Frank has been cave flooding ever since he was a little kid. In fact he flooded my pet dalmatians cave just last weekend.
by ElFucko August 05, 2014
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