Slang for when someone propels themselves through a still body of water, usually a swimming pool, entirely by passing gas.
This amazing and talented young woman apparently has the most powerful farts on the planet; I watched her doing the buttstroke the entire length of the high schoolgym pool!
the act of striking someone with the buttstock of a rifle, carbine, or shotgun. This is in contrast to "pistol-whip," which is the act of striking someone with a handgun, while gripping either the handgrip or the barrel/slide, but more commonly the latter.
"The brave Marine, having expended his last magazine, but lacking a bayonet, sawfit to buttstroke the charging enemy combatant."
the action of hitting someone very hard in the face, gut, genitalia or other highly sensitive area (typically gender specific) with the butt of a rifle, shotgun, pistol or other firearm with a designated "butt".