Top Definition
'Doing a Riff' is when one person claims to be madly in love with another person and enjoys telling everyone about it, any time. Then a few days later they have dumped them and are 'so in love' with someone else.
Person1: I love Jen so much! She's so amaaazzzzinnng. I just really, really love her.

***3 days later***

Person2: Hi! How are things between you and Jen?
Person1: Huh? Oh I dumped her. I'm in love with Angelina now. I love her SO much.
Person2: You're doing a Riff again!
by reallygoodname March 20, 2006
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