dood1: man look over there  dood2: man that is gross  dood3: what happened?  dood2: i just went down ass crack lane :|
when you can see someone's butt crack and look directly into it
"dood1: man look over there  dood2: man that is gross  dood3: what happened?  dood2: i just went down ass crack lane :|" What is the definition of "ass crack lane"?