when a statement is made, it is someone who replies to the statement with some kind of idiotic phrase that is just a bunch of jumbled nothingness and should have not been stated at all, and after the "tubbs" does this you are to yell at him/ or her and tell them how idiotic they are and tell them to shut up, possibly even punch them.
Someone can also be called a tubbs if they have a goat. in that case u just touch the goat and make fun of him saying he hates it.
Another definition for a tubbs is someone who has not yet learned to talk to the opposite sex, so you make fun of them and tell them they talk a lot and they know what they are doing.

The guy that defined hot and suave on Miami Vice - a solid icon through the 80's era.

This is the name given to a fat lazy women that you work with, tends to be in an office environment. 'Tubbs' will try and avoid any work by procrastinating constantly either by talking, aimlesley walking round the room looking for things or eating. 'Tubbs' will have an addiction to yoghurts and always devour every last morsal, sometimes even spending up to half an hour scraping out the bottom of the pot. 'Tubbs' has no drive or enthusiasm to succeed in life but expects everything to be handed to her on a plate. Tubbs is also a very nosey person, a bit of a no-it-all and just generally a pain in the ass.