When someone prevents you from doing something either physically or metaphorically from going any further with your intended endeavours or intentions.
E.g. 1. Yeah, she really wanted that Saturday Job at the Ice Cream Parlour but then her Parents flatwalled her by grounding her on the day of her interview just so she couldn't get the Job - unbelievable!
E.g. 2. Without her parents signing her grant form she won't be able to go to University and they won't do it because they don't want her to go. However, she's smart so she'll find a way around that flatwalling.
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.
"Base we've got some square groupers floating outside of Miami harbor."