A common nickname for the STD known as gonorrhea. People give this name to compare their spotty sack to Mr Tumble's spotty bag.
MrTumble'sspottybag is his bag which is a recurring weapon in the anime.
Person A: Do you have Mr Tumble's spotty bag?
Person B: Ew no gross... I use protection!
Person C: Lift your hand just like so.
Person A + B: Do you have Mr Tumble's spotty bag?
The hypothetical man (often a sinistercharacter who decided not to go to boot camp) that is doing your girlfriend/wife while you are on deployment overseas.
Ain't no use in goin home,
Jody's got your girl and gone.
Ain't no use in goin back,
Jody's got your Cadillac,
Ain't no use in feeling blue,
Jody's took your checkbook too.