Top Definition
A sexual position in which a man titty fucks another man that has large enough man-boobs to allow such a vile act.
That guy is so overweight that his tits are so huge that you can give him a guyser.
by Pacos Bill April 30, 2008
1 more definition
The explosive regurgitation of semen acquired during a long bout of oral sex with multiple partners.
I was number twelve in line, so I knew I had to get off quick before she gave me the guyser.
by Ol' Derty Sanchez March 08, 2007

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