1. A word used to acknowledge the presence of a fellow companion
2. For a man to express interest in a particularly impressive female specimen
3. To contact via telephone

Lying flat refers to a defeatist lifestyle in Chin, where people stop working, desiring material acquisition, and tap out of any social life – sometimes for good. By lying flat, young people are participating in a kind of non-cooperation movement, rather than surrendering themselves to China's oppressive work culture where they see little hope of social mobility.

it depends upon the context in which you are using the word.
1.)a term used to try and talk or try an "hook-up" with a female.
2.)meaning to talk to someone or telling somebody to hit u up later

interj. 1. an exclamation of greeting. 2. an exclamtion used to show excitement or enthusiasm. verb. 1. to call. 2. to summon

A greeting that seems recent, but was used as far back as Shakespeare's time.

Synonym to every verb in any language known to man.

1-Expressing approval for a statement or suggestion.

2-Word used to somehow gain the attention of another person.

3-yes