Top Definition
Blocking someone on a social networking site, hookup site or app before that person has ever had a chance to contact you.
Gay Guy A: Eww, look at that nasty old man!

Gay Guy B: Gross, he's so old he's like 35! Did he contact you?

Gay Guy A: No, I pulled a Preemptive Block before he could ever dare try to get with my hotness!

Gay Guy B: Nashty.
by Larrold May 14, 2011
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