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3.
A radical thread on a forum or image board.
Or a rad thread.
Proper use.
"Come to this thrad"
"This is so thrad"
"Thradical!"
by Shaiza7 October 22, 2011
 
1.
Michael Jackson between his 'Thriller' and 'Bad' eras. Generally between 1985 and 1987.
Person 1: "See that picture of Michael there? It's not Thriller and it's not Bad. It's 'Thrad'"

Person 2: "Yes, he looked pretty damn fine in his Thrad era."
by ParmaViolet February 17, 2010
 
2.
An advertisement disguised as a discussion thread. Spam.
I went to read this hot chick's blog posting, but it turns out it was just a thrad for her massage services.
by jsonpter May 30, 2009