The word originates from the way that in TV shows and Films, when somebody makes a bad joke a piece of tumbleweed rolls past.
The word tumble can also be used to describe someone who makes bad jokes, or someone who is generally perceived as a bit of a "loser".
Also, a situation which didn't go as planned can be described as a "tumble".
Other uses of the term include:
Tumble Beg - Someone who makes bad jokes, is perceived as a loser, and begs it off girls and/or begs it for popularity.
Yeeeuuuurrrrr a teeeuuuummmmbbbbllleeeeeee - Used to proceed "Bing"... "Bong".
Pablo: I got more rolls than the bakers dozen G.
Luca: That kid is such a nerd, look at him with his shiny shoes!
Matt: Yeah mate, what a tumble.
Swagdon 1: Crap. Something is wrong with my cell phone.
Slagdon: Oh really? What's wrong with it?
Swagdon 1: Its just that...your numbers not in it.
Swagdon 2: Tumble Beg.
Lewis: Yeeeuuuurrrrr a teeeuuuummmmbbbbllleeeeeee
We all knew Fred had a bi streak to him, but it wasn't until he met Joey that he finally tumbled.
If you are looking for first timers check out that gay bar on the edge of town. It is known to have a lot of tumblers hanging around.
Guy 2: Hey chick come over here!
Chick: Oh my god guys, did you see that (insert band name here) in concert?! They are just sooo perf, I can't!!! asdfjkl!
Guy 2: Oh god...