1 definition by MK tm 2009

'Scooting Under the Influence'

To be caught riding your scooter (a Macro scooter, if you will) whilst under the influence of alcohol. Scientific inquests have shown that enjoyment levels augment by at least 150% whilst scooting under the influence, whilst death rates rise accordingly.

The most famous recipient of an SUI is the ficticious John "J.D" Dorian, from Scrubs.
Lad 1: "Fellas, i got an SUI- sweet"
Lad 2: "Buy this guy a pint"
by MK tm 2009 June 13, 2009
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