Referring to "Dirty Baby" without pronouncing the R. The R can be added as an option. Ditty baby is the smell your unwashed butthole leaves when you have what is commonly referred to as "swamp ass" or "swass". The smell is sometimes left on pants, and if severe enough can be smelled by others several feet away. other common places to find this smell is on a couch or chair cushion after someone who is suffering from Ditty baby stands up. The smell is basically, ass, but has been described as a combination of armpits, feet, and parmesan cheese.
"Oh! change your pants! you smell like Ditty Baby!'
"I have a serious Ditty Baby problem brewing, I hope no one smells it."