Butrobics 

Excercise for your bottom. Often done by walking long distances and going all day while clenching your Bumb cheeks.

The effect is, (after extensive butrobic programmes and devotion) a rock hard ass.

Jack: Fresh from 2 hours of BUTROBICS, i give you, MY ASS!

(Moonie)

Butrobics by Jody Harris September 1, 2008

Barobics 

The act of exercising through lifting glasses of beer while drinking in a bar. The more drink consumed the more sufficient the exercise.

''Hey Steve. Are you coming for a run after work?''
''No thanks Richard. I am already booked in for Barobics at Joe's Bar at 7''

Barobics by Billy No Mates December 19, 2013