The act of pre-sexual, usually inebriated, penetration when the male has a semi-erect boner. The boner is not hard enough to penetrate the vagina. The male, knowing it will get hard once inside, takes his thumb and forces, or "pushes," his semi-boner into his females vagina.
Dude I was so fucking hammered i had to smushpush my dick into her last night.
by Blumpkin Prince March 07, 2010