gock block 

An instrument used typically by marching instructors that is made out of plastic or synthetic woods. The gock block is hit in order to establish or keep a tempo for musicians to march or play to. Also referred to as met or metronome.

Student 1: Bro, where's the met clicky thingy?
Student 2: You mean the gock block? I think it's in the director's office.

gock block by JFC420 September 27, 2015

gock block 

a term typically used by major band geeks, when the gock is stolen from the drum line by the drum majors

Dude, you totally just got gock blocked!

gock block by el93 August 20, 2010