(Verb)
To have sex with an individual, and then after said intercourse, escape at the earliest convenience with/without the consent/knowledge of your partner.
The chicks fine, but I think she has Pica. Smash-And-Dash for sure bro!
When someone uses the bathroom at a place of business to take a shit without buying anything. It is often accompanied by weak attempts masquerade as a paying customer, followed by a quick exit from the building.
On the way back from camping, I had to pull a smash and dash at the Taco Bell. It was the only place around for miles.