90s-00s Merseyside slang, loosely meaning a ridiculous idiot. Calling someone a “goat” or a “pia goat” was a common insult used around certain parts of Merseyside. The addition of the word bladder adds further a layer of ridiculousness.
Whata piaaa goat, absolute goats bladder!

That juggalo Jake is a proper goats bladder!!
by Kurt Gaiger December 10, 2020
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When you eject liquid poop with such ferocity that it sounds like urination.

Typically not a one time event. This condition will haunt you for many sessions.
Dude I ate that raw meat last night, and was up all night with butt bladder.
by fukengruvenman February 1, 2014
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When you have to pee and can't wait a second more.
Can we hurry? I have a full bladder
by SelEmma February 12, 2012
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BOOBIES;those large milk containing sex magnets
I could suck on those Milk Bladders all night!!!!
by Mike169 March 13, 2008
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An excessively lengthy event, such as a multi-hour class, meeting, show, line or worship service, that drags on without breaks and keeps its captive attendees from heeding nature's call, resulting in great discomfort, inability to pay attention, and, in the most severe cases, ruined clothes and seats.
That three-hour meeting was quite the bladder buster.
by FairVanity January 21, 2010
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The act of not urinating for a very long period of time after the urge arises. Most commonly happens when online someplace interactive because you dont want to miss anything by going to the bathroom.

Said by some to "expand" bladder capacity.
IM: Yhatcha Doin

RE: Nuttin - well, still doin Bladder Olympics

IM: Dude! - didnt you drink like 4 cups of coffee?

RE: Yup (BOOM!) <dies of exploded bladder>
by Streigh June 24, 2009
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