What is Do Shit?
1.
The act of being michevious when bored out of ones mind.
When Mike, Matt, and Logan were bored, the decided to do shit.
See
2.
To have sexual content that is more than just kissing, and implies all other bases other than first.
If you're horny, to an attractice person:
"Hey- wanna do shit?"
About your best friends who just did sexual things on your bed:
"They totally just did shit on my bed! Now I have to make them wash my skanky ass sheets!"
See