(adj) a positive adjective used to describe a hardcore and good sounding guitar lick.
"manky" refers to the lick being "sick" or "ill" witch in slang terms means good.
Drummer: "I'll lay down a beat"
Guitar: "ok cool, i'll lay down some manky chops over it."
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.