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1.
A doublay is when a person vomits and shits his/her pants simultaneously. It can also be called a blay, if you just shit yourself, with no puking action.

I first heard of this term from a zine made by a member of a punk band called Marilyn's Vitamins...they heard it from a band called Choke.
Aww man...I was so wasted last night...I did a doublay right outside the bar.
by jer July 28, 2004
 
2.
Doublay should be used instead of Double at all times.
Oh my god, PA did the Doublay!!!
by Duckschoen June 02, 2009