Thumbling 

Engrossed in your phone or device while being oblivious to the world

It's the worst when you're walking down a crowded sidewalk and you get stuck behind someone walking slowly because they're thumbling.

Thumbling by Munirih19 September 15, 2014

Tumbling the turtle 

To take part in a sexual activity.

1. Can you come out tonight?

Tumbling the turtle, sorry..

2. What'd you get up to earlier with that girl?

We were tumbling the turtle.

Tumbling the turtle by The-Master-of-Disaster October 20, 2012

tumbling sixpack 

When the abdominal area gets fat and soft and starts rolling and weeping down over the waistline of pants

That lady should not be wearing a two piece bikini with that tumbling sixpack shes got.

I used to have abs of steel....now I got me a mad tumbling sixpack.Damn,marriage sucks!

tumbling sixpack by Lunicus December 19, 2006

Tumbling 

The act of spending one's time on Tumblr.

Not much just tumbling.

Tumbling by PerogiXW1 May 7, 2011

Tumbling Tiger 

A decisively difficult maneuver, the Tumbling Tiger requires the performer to anally insert the penis into a receiving hole and proceed to roll down a hill whilst maintaining the said position.

I once attempted the Tumbling Tiger and now it is difficult to discern whether I am a man or a woman.

Tumbling Tiger by toenailtim April 27, 2010

Tumbling 

The act of having sexual intercourse

Garret was totally tumbling with Jalen.

Tumbling by IsoSickle April 15, 2014

Trumbling

Anticipatory anxiety, possibly inducing physical trembling, that President Donald Trump's policy-making decisions will cause irreparable society-wide socioeconomic suffering and global geopolitical destabilization.

I'm so afraid that President Trump will go ahead with the action he's considering taking, that I'm trumbling.

Trumbling by 1<l10mmm November 9, 2016