1. A puddle on the ground that you don't notice until you've stepped in it.

2. A puddle that seemed shallow until you stepped in it. Turns out that it's not shallow at all. You end up ankle-deep in rain/piss/vomit, etc.
May: "Why the hell are your jeans soaked to your ankles?!"

JJ: "I stepped in about seven ninja puddles going across the campus."
by maxcee December 8, 2009
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a person who runs around and splashes people with puddles
guy 1: awww man, that puddle ninja got me
guy 2: he hasn't got me yet *splash*
both: fucking puddle ninjas
by wu ninja clan November 15, 2012
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