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1.
To either orgasm while talking or to talk while orgasming. Simples
"Hey I wonder when the pizza man gets heruuunnnggggguuhhhhhhhhhh..." "I just had a talkasm"

or

"uuuggnnnnnnoohmygodthisisamazingahhhhhhhyeeeeaaaaahhh" "What a talkasm"
by ninjamonkeydrummer April 17, 2012