Definitions by 207s finest

Swain Brain 

When one pulls their nutsuck over the flacid shaft of their penis and says "THE BRAIN".

M.I. walks into the bathroom
B-Sweez follows him in with an awkward look in his eyes.
M.I. proceeds to urinate
B-Sweez unleashes the "Swain Brain"
M.I. turns around
B-Sweez yells "THE BRAIN!!"

Swain Brain by 207s finest April 27, 2010