Alternate term used to describe the club drug MDMA, commonly known as Molly. The genesis of the name evolved from the less common "Maggie" to "Margaret" to "Margaret Thatcher" to "Thatcher."
See also: Thatch, Thatchy, Thatchering
Dude, Herb did so much thatcher last night at the club that I could hear him grinding his teeth over the music!
(n.) A wanna-be skateboarder, poser. Commonly seen riding a penny skateboard, or longboard. Shops at zumiez, and wears everything from there. Usually plays lacrosse, and uses words such as "yolo" and "swag" seriously.
Haha, look at that lax-bro who is mongo pushing alongboard while wearing clothes from diamond supply co, he's skating just to look cool. What a thatcher.