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When you lose in an online game because your team sucks.
Friend: "So how was playing Call of Duty last night?"
Other Friend: "We sost."
by Whiffy5 August 24, 2016
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Verb. The act of sucking on some titties. Usually referd to a man sucking on some bitches boobs.
Dude i was so wasted last night at this girls house i think i SOST.
by DandT November 17, 2005
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