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1.
An inexplicable and deafening outburst of simulateous girlish shrieks experienced at a pub. Commonly witnessed during bachelorette parties.
Mark suffered a heart-stopping scare when a booth of women next to him errupted in a bargasm over seemingly nothing.
by IrishLaddy May 07, 2009
 
2.
A bargasm is a word to describe finding an item that is so much so a bargain it all but brings you to orgasm.
'Oh my god, i't a right bargasm, i could wee!'

My own quote said upon finding a fab designer dress with 50% off.
by Worksop Bird Ellie August 02, 2007