This is an incredibly popular french phrase which has been as over used as the word "fleek". It means 'do you want to sleep with me tonight?' If you still don't understand this I'll break it down into normal english. 'Trynna smash?'
Sup girl! Voulez vous coucher avec moi ce soir? I would but i'd actually rather shove my head down a toilet.
The word "sussy" means suspicious, and "moi" is an expression to call your sister. This is an expression to call a special type of sister that is sussy all the time. It has grown popular during recently because parents give their kids ipads these days.
"Hey what the fk are you doing on your computer!?!"
*the moi closes roblox tab*
"What? Nothing.."
"You liar, I just saw you switch tabs, you sussy moi!"
Quite common expression used to get people off your back after a phonecall you wish you never answered.
A: So basically, our company could really help your company save you time and money
B: Oh ok, envoyez moi un petit mail then !