Adjective used to describe a motion of approval when an unspoken or undescribable emotion occurs. Ususally as a result of music, a hottie patottie, or other things. Often the motion is along the lines of dancing. First said in the song, "Party in the USA" by Miley Cyrus.
A method of nodding one's head or movin' one's hips.
Joe: Who was that girl you were dancing with earlier?
Paul: You mean the one nodding her head like yeah?
Joe: Yeah, and moving her hips like yeah.
Paul: Oh, that's my 12 year old sister.