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1.
Pronounced "Boo-blay," as in the singer Michael Buble, it means to trick or punk a person.

"I had planned a barbecue for a few friends. But the rain bublayed me."

"I'm going to bublay Mike this year for April Fool's day by leaving a cake with black frosting outside his front door."
by Brenda loves Dylan March 31, 2009
 
2.
The act of a person urinating into their own mouth whilst standing upright

This act resembles drinking from a drinking fountain or more appropriately a bubbler
"George had to clean up all that piss on the carpet because he gave himself a bublay in the lounge room last night"

and

"one of you.... will watch me do a bublay"
by Flynno December 13, 2009