Feed the beast 

To eat a lot of lean protein and carbs after a long session of weight lifting. You need the fuel to replenish muscle and curb your hunger.

The beast in question is let loose during the workout, so you need to feed it during the rest of the day.

Daniel was hungry after bench pressing for an hour straight, so he came home and had to feed the beast with a footlong chicken breast double meat on wheat from subway.

Feed the beast by bodybuilder45678 August 31, 2010

Poke the beasty and feed it some grass 

The compex analysis of theoretical problems with no solutions.

Megan: I need some help deriving the isothermal expansion of reversible work.
Joe: Well, just poke the beasty and feed it some grass.

Poke the beasty and feed it some grass by Alpha sinuclein January 30, 2018