One of the only words that can be used in just about any situation and will 100% make sense to someone that has never heard the word.
person 1: OMFG you are such a mecklem
person 2: damn so aGgReSsIvE ----------------------------------------------
person 3: Move your mecklem!
person 4: Sorry... I'm moving
generally refers to being treated unfairly or taken advantage of in a situation, typically resulting in negative consequences for the person who was screwed over. The phrase is often used to describe situations in which someone has been deceived or betrayed, or in which someone has been given an unfair or raw deal.