1. To successfully assault contemptible persons.
2. To penetrate a woman's vagina in a rough manner (generally with her consent).
3. To drink copious amounts of alcohol.
4. To put great effort into an activity. It can applied to any type of activity, as long as the person doing the activity has given it everything they've got.
ETYMOLOGY: Fucking smash
"I told him I like it rough, so he really smashed my cunt!"
"Are you coming out to smash cunts tonight?"
"I smashed that exam right in the cunt!"