A bellshabob doesn't have a solid definition. Originally designed as a shish-ka-bob of bells. Normally used in the phrase "You bet your bellshabobs" as an affirmative. If asked for the definition, you must give an outrageous answer that's never been used before.
"Hey Sarah, you wanna go to the mall?"
"You bet your bellshabobs."
"...okay..."
"Hey Joe, what's a bellshabob?"
"A rare type of STD that looks like gold chickenpox on your dick."
Another word for a person who is a dick. More playful and abstract than the word dick, also used to describe someone when they do a silly or dickish thing.
Can also used to describe a silly or stupid action.
He's a bit of a bellshaft.
You're acting like a bellshaft.
That was a bit of a bellshaft thing to do.