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1. The act of being like a stallion.
2. Amazing like a stallion.
3. So amazing you feel like you just got kicked in the head by a stallion.
Josh: Man, that was freakin stallacious!
John: What the hell is stallacious??
Josh: It's beyond amazing man!
John: Oh i get it now!
by Josh Garduna August 23, 2008
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