Slang for an uncircumcised penis derived by the action of pulling back the foreskin literally before intercourse, urination, or docking.
Matt: "Hey YOU come here, are you circumcised?"
Matt: "Sick dude, you have a fricken pullback"
Long and Floppy in reference to a redundent foreskin, but in many cases it becomes synonymous with asking if someone is circumcised or not.
Matt: "Do you have a LAF?"
Thomas: "What? Do I laugh?"
Matt: "No I mean do you have a LAF on your penis?"
Thomas: *pause* "Sigh, why does everyone know I have a redundent foreskin?"
Matt: "Don't sweat it babe, I'll make it up to you tonight =)"