When u grab your sack and squeeze forcing your balls to go tight against the skin, causeing THE BRAIN!!!
by J-dawg January 1, 2005
Get the the brainmug. Another word for head, or blowjob. This term is most appropriate however, because unfortuantley, most male brains reside in their penile regions
by Rae Rae May 13, 2005
Get the brainmug. Something that Justin Bieber fans don't have.
by Sum Gy August 27, 2012
Get the Brainmug. by Hello-There-1989 August 30, 2013
Get the On the brainmug. To strike a person in, on or upside the head deliberately and violently oftentimes with a blunt object.
by Nikki Stixx December 9, 2018
Get the brainmug. 
