look up any word, like rockabilly girl:
 
2.
A word to describe a poor connection to the '3' mobile phone network.

The '3' network is highly disputed among most (including 3 customers) to have the crappiest coverage of all of the UK mobile networks.
Sorry, my signal just cut out. I think my phone's just being Threetarded.
by KevalD April 29, 2009
 
1.
More than retarded, retarded to the third degree.
Dude, yo' mama failed the second grade? She must be threetarded!
by AZNE Taylor January 08, 2006