dude 1: what'd you do last night?
dude 2: went to some bar. got a handy in the bathroom.
dude 1: sick yo. who was the chick?
dude 2: no clue. it was a rando hando.
A randomguy who inserts himself into a conversation or shows up unexpectedly and acts like he belongs.
"I'm waiting for my test results, hopefully it's not HP-"
"HEY, what are we talking about?"
"Whoa, Rando Calrissian! Fly your ass back to Cloud City, we're having a private conversation."