Top Definition
The act of behaving like an idiot when out on the town. Comes from a cross between grenade and radiation, as people who do this tend to have the effect of exploding through a club like a grenade and radiating annoyance through the crowd.
Dunco:"How was Mick last night?"
Ello:"No good, it was total grenadiation, he got us kicked out in ten minutes"
by Dunco November 01, 2005

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