Top Definition
the short way of saying yesterday
usually used in chat rooms such as msn
person1 : dude did you see how mashed i was yday

person2: yeh lol yday was jokes
by gangster67 July 30, 2006
4 Words related to yday
What did you do y-day?
by -__-__-__-__-__-__-__-__-__- August 28, 2009

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