Smatch is a combination of the words "Smash" & "Match". "Smash" is a term used for getting laid or getting the butt cheeks and "Match" is a term using for going 50/50 for weed or chronic. If you would like to get high and have sex after this is the perfect word!
Yo bitch lets Smatch! or yo shawty after class do you want to Smatch?