Phrase used to inconpicuously talk about a girl's breats, even if she (or her brother) are listening to you talk. Derived from cleavage. Works well since most people will think you are discussing the Cleveland Browns football team's offensive line.
Man, did you see cleveland's front line?
Clevelands front line is HUGE!
When clevelands front line walks into the room, it attracts alot of attention.