A "flame grill" also known as a "Flame Grillin" is the act of tackling some one to the floor, pulling down your pants, rubbing your anus cheeks against they're face and finally letting out a juicy fart. May require more than one person to perform.
Ryan:"Hey Christian lets give tyler a flamegrill!"
Christian:"Yeah baby flame grillin love!"
Tyler:NOOOOO!
Christian: FART!!!!!!
Tyler: Eeeew! All I can taste is anus!
Ryan:Flame Grill Baby!
Basically, it's very similar to the term "Netflix and chill". But with some large variation. The act of inviting a friend over to watch something on Netflix, then lighting each other on fire, and having sex while on fire. (Do not try this at home under any circumstances!!!!)
Guy: Want to come over for some Netflix and grill?