Explaining a concept too much, adding way too much detail to the point that it becomes boring.
Honey, you're belaborating. Just get to the point.
1. beating the top of one's head
2a. having sex with a pumpkin*
2b. masturbating
*Fun fact: If you have sex with a pumpkin, you are actually having sex with a fruit, not a vegetable...so the taboo does not apply!
1. From Canto XVIII of Dante's "Inferno" (Longfellow translation):
And he thereon, belaboring his pumpkin:
"The flatteries have submerged me here below,
Wherewith my tongue was never surfeited."
2. I have to go bail my uncle out. They picked him up for belaboring his pumpkin in a Wal-Mart dressing room.