Top Definition
(1)To be in top-form on a nite out; (2) to be hyper and really enjoying oneself;(3) to be awesome craic and full of witty comments and comebacks; (4) to be off your face on drugs and having the time of your life; (5) to be truly focused and determined to get something done (6) to perform extremely well

Ah Ba'Jesus I'm in deadly mode tonight lads, nothing can bring me down!
by Dockslide McGeown April 18, 2009

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