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1.
when your drinking and you have to go to the bathroom, you do not want to "break the seal"
but you have to.
Jim: Hey did you see the game last night?

Steve: Hold that thought i have to go void the warranty. (puts down his beer)
by Stevie B's Warehouse July 10, 2008
 
2.
To perform an activity in an extreme fashion.
"you're hitting the bars tonight? Let's void the warranty!"
"I voided her warranty all night long"
by tahot November 05, 2011