Big manting - Is a term that is used by young people in prison and on the streets in London. It generally means, "Swear down." Or in true English, honestly or in all seriousness.
Person A: I'm gonna get a Honda Civic Type R with my drug money Big manTing.
If someone is on the 'Big ManTing', they are looking super fly. This term can be used to describe an item of clothing, or simply just to compliment someone's style or actions.
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.