The term "Craig MacTavish" means to have unprotected sexual intercourse with a girl. (ie. sexual intercourse without your "helmet" (a condom). Craig MacTavish was the last North American professional hockey player to play without a protective helmet, having signed his first pro contracting just before helmets became mandatory for all new players. The term was founded by the students of the Pharmacy Department at the University of Toronto.
"Hey bro, did you Craig MacTavish her last night?" ... "No, man, turns out she wasnt a fan of Craig MacTavish."