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1.
iyd
IYD is short for:

In Your Dreams
friend:I'm so good!
you: yeah right! IYD
by mina February 26, 2005
 
2.
iyd
"If you're down"
Stoner: Let's go smoke a bowl and watch Pineapple Express, iyd.
by OriginalLexicographer January 02, 2014
 
3.
An acronym for "If you're dumb, suffer"
"Did you hear about the guy who burned his genitals imitating the Jackass movie?"

"IYDS"
by Herb Jenkins March 09, 2007