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1.
Flockem is mostly used as a "fuck you" or "fuck 'em" type of insult.

A shortened vertion is oftentimes used as Flock, such as Flock you!
Ex. 1:
Joey: Come at me bro.

Jason: Flockem!

Ex. 2:

Joey: They want to beat you up, Jason.

Jason: Man, just flockem.
by Savhanna (: September 12, 2011