A phrase used to describe a person who should not be underestimated. A practical term which can be used with most anyone in any situation where the individuals abilities, conduct or intelligence might be underestimated.
I know the Kobe and the Lakers have won nine games in a row, but Manu Ginobili is a Laker killer. Don't sleep on Manu Ginobili!
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.