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3.
Dodgy stuff, too close to call, of dubious merit, some characteristic or aspect that "the jury is still out" on. Something that is debatable.

Etymology: Akin to when during a cricket match the on field umpires are faced with a decision that is too difficult to make and so they refer to the Third Umpire for a ruling.

Tom Cruise eating placentas is Third-Umpire.
by Sidhypes December 11, 2006
 
1.
Dodgy stuff, too close to call, of dubious merit, some characteristic or aspect that "the jury is still out" on. Something that is debatable.

Etymology: Akin to when during a cricket match the on field umpires are faced with a decision that is too difficult to make and so they refer to the Third Umpire for a ruling.
Tom Cruise eating placentas is Third-Umpire.
by Sidhypes June 13, 2006
 
2.
Cricket: Used when the on-field umpire is unsure of a decision regarding run-outs, stumpings, and the legality of catches. However, they now use it as a cop-out as they are too pussy to make decisions. The third umpire plays part in the umpire decision referral system.
A batsmen is clearly run out.
Tired umpire calls for third umpire so he gets a break.
by Ranga O_o December 15, 2009