When you give someone a hug and your hands slip down onto their butt, usually followed by a squeeze.
Its not grabass, its a butt hug
by UrbanEdd August 28, 2008
The act of embracing a man's penis with your rectal cavity.
Mike looked so happy the next morning, we all knew Tricia gave him a butt hug the previous night.
by Explosivo1031 November 17, 2009