[Okay, now he's actually taking advantage of Hyunseok's inactive knowledge of all the latest dance crazes. Ryuji laughs, and brings his hands down to his side. It's been pretty good up until this point, though.]

Flossin'... it's a dance move, dude.

[Which makes his pun completely inoperable.]

Yeah. You don't actually... do anything to your teeth, you kinda just move your hands around like you're doin' it. But between your legs instead of your mouth.

[And scratches his nose, smirking to himself.]