Top Definition
The act of urinating on another person's plot of land because there are no other trees to be found on public property.
YTMND Person 1: So I was tresp-ssing on someone's property...

YTMND Person 2: You were Trespissing?

YTMND Person 1: ...
by Satori Lawliet October 22, 2008
1 more definition
To urinate illegally on property that doesn't belong to you.
I was walking home from the bar last night and I needed to go so bad, I had to stop and trespiss behind the elementary school.
by Old Janx Spirit August 09, 2012

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