What is Tubbles?
1.
The nickname given to a fat kid by his "friends."
1 Tubby Tubby, 2 Tubby Tubby...
2.
Tubbles occur when one flatulates in the act of taking a bath.
Mr. Crid is relaxing in the bath after a long day and he is quite relaxed. So relaxed in fact that he excreets some gasseous ommissions which sound like a rapid fire bb gun on the base of the porcelain tub but also result in "tubbles" that float upwards releasing air thusly produced.
See