Mr. Park's explanation is plausible.. but could you also have meant:
그냥 뻗었지!
뻗다 means to stretch out, relax, .. it can also mean to be knocked out, keeled over, including after drinking alcohol. :) I wonder what context you saw or heard this.
2014년 12월 23일
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That is a wrong spelling of "그냥 빼앗았지"
그냥 means "just"
었지 is composed of
빼앗(다)+았+지
빼앗다 means "steal, rob, extort"
았 is past tense particle
지 is an ending particle.
"그냥 빼앗았지" means "I just extorted it"