Top Definition
YMBNH - shorthand for You Must Be New Here; used in internet chat forums to slightly mock posters of redundant/obvious comments
Michael Welu: Isn't it just as big of an ethical question to buy dino diesel, which untimately came from dinosaurs?

MrErlo: YMBNH, refer to post 18. i was already corrected that "dino diesel" is mostly plants.
by MrErlo July 21, 2006
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