Twos up on a bastard 

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?

Twos up on a bastard by christophe August 4, 2004

Twos up on a bastard 

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

Twos up on a bastard by Mu11y May 1, 2006