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When a man with exceptionally erect nipples, inserts them into the lady's va-jj in a thrusting motion to provide a kind of average pleasure wave. Popular practice on the european continent.

Popularised by British comedy duo Anna & Tom.
"I'm not in the mood for sex, but my god, i would just kill for a good old nipple frig"
by Frigsters April 19, 2010
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