Abbreviation of "look at that" or "look at this," typically uttered shrilly in public places by small children seeking to draw attention to mundane objects that they, for some reason, consider fascinating.

When someone wants you to look somewhere but your busy

A cool band from Atlanta that writes interesting and unique songs. I’m still trying to get “Body Heat” and “Green Ideas” out of my head. Also I think they’re from outer space.

said to get one's attention

This is a combination of "look here now,or just plain "look"." It is used when you are somewhat frustrated with a person, and want to get their attention real quick and advise them they are incorrect, are missing the point, or do not understand, and therefore you will explain or clarify the situation to them all over again.

An exclamation, to point out a happening or or warning of disagreement.
Abbreviation from : Look it here

commonly used by french Canadians in Northern Ontario. Also could be used by uneducated English people who don't know any better.