One who gets insane amounts of vagina. This guy doesn't care what time, or place he's at. Every moment he is DTF, and so are the multiple ladies riding him daily. Used to describe a soon to be known sex god.
Did you hear about that guy?" "Yeah dude, that's the seventhsorority girl he's smashed this week, and it's only Monday!" "Man this guy is such a Smashaw." "Damn right he's such a Smashaw.
In grand strategy games it is the act of backstabbing allies that make sense to have. This can include, not joining wars of natural allies, betraying agreements made, or becoming enemies for no reason. It is also the act of over committing to allies that make no sense to have. This can include death warring over the most minor of things, making bad allies, and trusting people you shouldn't.
Dude 1: Man I can't believe Dave betrayed me to team up with somebody who he is enemies with.
Dude 2: that is just some smallsaye diplo for you.