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1.
Incubating can either mean sitting in one place for a long time, sitting on top of an item or chilling out.
"Hey! What's up?"
"Nothing much, just incubating on the couch"

Or

"I can't find my car keys! Oh wait, I was incubating them"
by Sweet Lou and HBG January 12, 2004
 
2.
Defecating. Short for incubating (sitting on) the porcelain goddess, a parody of praying to the porcelain goddess
I was incubating your mom's face last night.
by Jmtas September 10, 2006