To deficate in the toilet tank of an enemys toilet. Upon discovering the said turd, they say grrrrrrrrrrr, or they grumble.
Kelly was not happy when Don left her a grumbler.
A Person who does nothing but complain about everything and anything around them. They are usu. male and over the age of 55, they tend to have short tempers and rarely if ever smile
Peter is a frequent grumbler, He hates anything that isnt him.