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An "add shag" is when you deliberately add a member of the opposite sex (or same sex, if you're into that...) on a social-networking site so you can try to mate with them.
Kyle: "Hey man, who's that?"
Dennis: "It's some bint i met on bebo called Fiona, i'm gonna do the old add shag routine on her,"
Kyle: "Mint,"
by Dennis McInally February 23, 2009
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