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1.
The point of one's attraction to another person is so overwhelming or all-consuming, they start acting like a retard. (Usually at least one degree past twitterpated.)
"My roommate is so ass-over-teacup for this dude, she's acting like a total retard. She's retardipated over him."
by MoniTheButt December 03, 2013
 
2.
1)The act of being retarded, as if drunken, however one is not drunk. 2)To try something retarded or stupid, knowing full well that it fail.
"I tried putting the dog in the bath tub with Betty. She just looked at me as if I were retardipated!"
by Baron M August 23, 2006