Liking or disliking something, especially, but not limited to a YouTube video, before you see it entirely.
Guy 15 seconds into watching '10 minutes of Hitler saying 'Nein!''
Guy: Oh my God, this video is awesome! *preemptive like*

*1 minute later*

Guy: This is so boring...
by Riot man October 14, 2011
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1.) Similar to premature ejaculation, but occurring even sooner.

2.) Jerking off to calm down before meeting up with a girl.
1.) Bob was so horny, he preemptively ejaculated at first base.

2.) Preemptive ejaculation will keep you from doing something stupid on your first date with Brandy.
by daveroust August 14, 2011
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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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Going to the toilet before it is necessary, preventing a later urge. Useful before going to movies or long journeys without pauses.
I'm just going for a preemptive shite, before The Dark Knight begins. I don't want to miss ANY of the action!
by Duffdrinker October 5, 2008
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d1. the act of strategically situating one's penis prior to an inevitable erection in order to avoid embarrassment

d2. tucking your flacid dick somewhere not noticeable when you know you're about to get a boner
She's really cute and I know she's a long hugger so I did a preemptive tuck into the waistband before we said goodbye.
by hewhocreatesall August 8, 2010
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The movement of both the radio and retail industry that will see stores set up for the holiday season and radio stations blare out Christmas music 24/7 usually starting around Halloween.
What's up with all the preemptive Christmas? Walmart's setting up trees, and I haven't gone trick-or-treating yet!
by This Hour Has 42 Minutes November 3, 2009
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A flush of the toilet prior to the end of a large bowel movement, intended to "preempt" the inevitable clogged toilet.
"Dude, I just passed a four pounder! Dodged the log jam too, with a mid-shit preemptive flush."
by pixeleyz August 18, 2009
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