When you're having sex with a guy and you randomly sing "Jason Derulo" loud enough for your roommate to hear so she doesn't feel lonely. Singing Jason Derulo's name also confuses the said sex partner into automatic orgasm.
Jason Derülo (n) Syndrome: A person with a very large ego. Someone who thinks he/she is 'larger-than-life'.
It is commonly believed that rapper Kanye West has the "Jason Derülo Syndrome", and that he was partly cured by his appearance on the TV show SouthPark.
A black R&B singer and dancer from Florida, Miami, famous with his pretty catchy single 'Whatcha Say'. Looks likethe nextChris Brown.
Josh: Hey how's your date with that hottie?
Mike: Mmmm whatcha say?
Josh: I said how's your date with that hottie?
Mike: Mmm that you only meant well?
Josh: Say what?
Mike: Well of course you did. Mmmm whatcha say, (whatcha say). Wha- wha- wha- wha- what did she say.
Josh: Man, you're so Jason Derulo!