Moosterbeef 

A person who a lot of people hate but a few like

Jeeze that is a moosterbeef

Moosterbeef by Madframe9913 April 27, 2021

Masterbeef 

To lift weights in the gym by yourself

Dude this sucks i don't have a lifting partner, i always have to masterbeef.

Masterbeef by Yendricklamar July 21, 2017