Amongster means among us gangster

1. to get with someone and perfrom sexual activities. -usually when drunk and at parties.

To go to a place i.e a club or pub and mingle with women or men,with the intension of pulling one of them.Or mearly to go into a place an hav a really good time.

A command to participate unreservedly; to make use of something without restraint. Go for it!

Also, 'Get Amongst It' is a very cool song by a vegan band called Vegan Band.

Used widely throughout the Australian medical student and broader community to express a desire to get involved with or get crazy at an event, particularly Convention. Widely abbreviated to GAI. Can be used in a larger sentence or as a stand alone phrase with the intent of g-ing up an audience.

It’s the game ‘Among Us’, but it’s so British that it is ‘Amongst Us’ instead

This may have two meanings:
1) Doing an extremely manly activity.
2) Or a much more literal sense, by actually being around a group of men.