Similar to Netflixand chill, Smash and smash is the act of having someone over and playing Super Smash Bros and then following that with one or more sexual acts.
Bro1: Hey I heard you and Abby Netflix and chilled last night?
Bro2: Nah man, we Smash and smashed.
a) To be heavily intoxicated, to the point where behaviour is erratic and the ability to walk straight is no more.
b) broken through
a) "A lot of people up here are getting really fucking smashed. I've seen like four people carried out in front of me and the show just fuckin' started" - Axl Rose