Top Definition
Stands for "Organization too secret to know"

Origin: Middleman Comics
sidekick is wendywatson

trained by sensei ping
When a job is too dangerous or too strange they don't call super heroes they call the MIDDLEMAN
Wendy Watson: where DO we get all the weapons and gear from

Middleman: Well ocasionally I get a parcel from O2STK full of weapons and inventions and....

Wendy Watson: Wait "O2STK"?

MIddleman: Organization Too Secret To Know
by Wade Wilson1452 January 30, 2011
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