Also used when Kicking ass at black ops and someone tries to talk to you, but instead of giving them an actual convo, you just tell them "I'm in Beast-Mode right now, GET OFF MY NUTS"
Bob: Dude, Jack has been in Beast-Mode for like 3 straight weeks
Will: I know, He has a 215 killstreak
2. From the popular Sega arcade game, Altered Beast, in which the game hero transforms into various beasts with exceptional abilities.
3. Marshawn Lynch touchdown, Seahawks vs. Saints 2011
"After they smoked that ounce of weed, Kelly and Shelly went beast mode on the french fries as a result of having the munchies."
"While we were f***in I went beast mode on her p***y!"