It originated from the term "I'll be back in a flash", but with the word "flash" replaced with "flask". It gives a double meaning now, where you can say "I'll be back soon" and also "I'll be back inside an alcohol containing vessel".
by lerppu July 26, 2004
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I'll be back in a flask • i'll be back in a year • i'll be back in two shakes of a toad's tit • "I’ll be out the gate by eight / in the spoon by noon / fixed by six / and back in the pen by ten!” • i'll be back • i'll be back right now • I'll be right back • i’ll be right back I'm gonna walk my dog • GARREN; I'll be right back! • I'll be black