Top Definition
Two unmarried people having sex which in the outcome could produce a child.

Try asking someone:
Hello cheeky, wanna go twos up on a bastard?
by christophe August 04, 2004
Two males having sex with one female (when neither are married to the female) which in turn could produce a child.
You go out and a sexy lady catches your eye! Ask your mate "Wanna go twos up on a bastard?" If he says yes try your luck and try and get a dirty threesome
by Mu11y April 19, 2006
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