What some people hear when someone with a Jamacain dialect says, "Lamb's breath." Which is a Jamacain strain of cannabis. It can also just mean weed in general.
"ShotDread in the head; took the bread and the lamb's bread."
When a group of guys all stand around one piece of bread on a table, etc. all jacking off onto the piece of bread. The last person to bust a nut on the bread loses and has to eat the soggy piece.
Man, it would suck to be johnny, i heard he lost in a game of Nut Bread last friday.