The tactical pussy is the act of a wingman taking one for the team by pulling a carefully selected girl so that an associate can score with her friend that they would not normally be able to do.
Guy A: "Hey dude, I fancy that blonde over there but she has too many friends around her.."
Guy B: "No worries man. I'm wankered, I'll pull the fat chick!"
Guy A: "Cheers bro! TACTICAL PUSSY!"