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1.
When somebody goes into a zone and plays like the greatest of all time (GOAT). Goat Mode is usually referenced in sports or anything competitive.
The Heat were probably going to lose until Lebron went GOAT Mode. He really took his game to another level.
by Ben Gerow October 30, 2012
 
2.
Goatmode is when you go to take crap, and it all comes out in tiny pellets.
Jeff: I'll be right back.. going to the washroom.

(5 minutes later after many small splashes are heard)

Jeff: Oh man.. I had major Goatmode in there.
by GristleMcThornBody January 02, 2011