Define Get This Meaning

To have sex, possibly involving the use of force; from the film "Borat: Cultural Learnings of America for Make Benefit Glorious Nation of Kazakhstan"

The verb GET is a synonym for to obtain. Right.
To GET GET would therefore mean to OBTAIN OBTAIN.
Now the verb GET GET is a slightly downgraded, less elderly offensive, and actively 007ish combination for GETTING SOMEONE or even, with the appropriate low rise intonation, GETTING LAID.

Now spread the gospel (when you're not get getting, that goes without saying.)

A positive statement to pump someone up like a cheerleader. To achieve a goal. Reinforcement on the repetitive notion to achieve maximal greatness at the task at hand.

Phrase encouraging whomever is listening to go ahead and move forward, doing whatever it is one is talking of doing without haste.

Getting in is before you do anything sexual or romantic, it's the getting close and talking before hand.

Get by = manage

When someone has to manage sth or a situation

The act of sexual intercourse.

A word used to identify a post with a certain number that marks a milestone on a forum.

A common example is on 4chan or a similar site where people race to obtain 4MIL GET (4000000th post) or perhaps even 7777777GET.

However, the GET may be either successful, leading it to be enjoyed and commemorated by the community or a failure, leading to posts filled with sage and general unpopularity.

if you're a girl, letting a guy put his dick in your vagina.
if you're a guy, means putting your dick in a girl's vagina.

To 'get with it' means to understand, to comprehend something or someone.