Vulgar slang, Caribbean Patua. Contraction of "mother's" & "cunt" implying that the person is stupid or ignorant, as though they had just come from the womb. Akin to "wet behind the ears." Also used in general as an insult or in reference to somebody, as one would use "motherfucker" in the states.
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.