You are really great.

colloq. phr. - expression used to convey admiration, gratitude, and/or affection. Often appears in conversations when one has impressed the other; whether it be by a show of one's talent or skill, or generosity and kindness at heart. Also effectively used in casual conversation as informal expression of love, especially when in the presence of others.

too be soo cool, to be really nifty

derived from new "old School" verb - meaning unsurpassed aka ectasy, or no equivalent to such a heightened state of pleasure. usually the recipiant of the "rocker" will identify the one who "rocks" immediately Note: "You rock" supercedes all other compliments.

US: Used to convey the idea of someone being cool or worthy, or that they have done something really amazing.

UK: Used by British people trying to bum lick others. Usually those trying to be ´Fake Americans´ and immitate characters from TV series such as Friends, Will and Grace or the Simpsons. Usually makes the user appear really stupid.

You saw something you preferred not to, but you're a forgiving person so you let it rock.

When you witness a person doing some funny shit but you accept it and still feel disappointed at the same time so you wanna let them be