The term beast mode is derived from the fact that animals and beasts do not use condoms. Therefore, if an animal or mongrel were to use a condom, they must then shout, "HUMAN MODE."
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!"