The art of "throwing a smokebomb" is when a person leaves very suddenly without telling anyone. Usually when a group is out drinking and someone has had too much.
This is when you meet someone that is Shiny and New, and they actually turn out not to be a cunt. So you're able to chat them up and have a good time conversating with them. Then when the time comes to part ways, you're so caught up in having a good time with them your dumb ass forgot to get ANY kind of contact information. And you know deep down that you will never see them again. Thus you got caught up in the smoke and grenaded any chance of anything with them.
Bro 1: Bro! I meet this girl at the DMV and she was smoken hott. She is the one, bro! She's the one!
Bro 2: Did you get the Number/Social media/Name or anything?
Bro 1: F***! no! I let myself get Smokebombed.
The hand gesture to tell others that you are drunk passed the point of being tipsy. The gesture is: hand motion of a ninja karate chop repeated several times in a row.
I drank to much its like I been blinded by a smokebomb, damnninjas.