A Begger's Canyon Bullseye is when you jerk someone off onto another persons asshole.
So, last Thursday me, a mynock and a wookie were getting hot and heavy. Ended up getting a Begger's Canyon Bullseye.
Another slang term for a woman's vagina.
Person 1: Hey girl, you know I love you, right?
Person 2: Yeah baby, I know.
Person 1: Well let me slip my dick all up in that lizard canyon of yours.