Country Dictionary

Kegger -
A party at which a keg of beer is present.
I here there's going to be a kegger at Jack's house tonight.

Thus, naturally a tubber would be a party in which a tub of liquor is present, most commonly being jungle juice.

Cambi is throwing a tubber tonight in honor of Ian's birthday.

A Tubber is someone who uses a hot tub often.
Tubbers are a group of people who enjoy spending time together in a hot tub or spa pool usually resulting in sexual behaviour or group sex.

"Hi there tubbers, is there room in that tub for one more, I want to get wet"

To tubb: fuck you micah stop looking you’ll never get a definition

Micah: look at me guys I can use the word Tubber in a sentence
Central Cee: Alright

The Best Fat Man out there. Tubbers is a guy who is just a man with a failed minecraft event. That reminds me MCM Chapter 2?

M: Yo Tubbers Whens MCM Chapter 2
T: IDFK

Aussie slang for a person who doesnt wash him/herself, i.e. avoids the bath 'tub'.

Look at him! He's a Non-Tubber! I bet if you scrubbed his back long enough, you'd find his school bag!