thumbelievable 

Thumbelievable is what you exclaim when you receive an especially good hand job.

Stacy had a thumbelievable orgasm from Jeff after the concert.

thumbelievable by Torbert September 8, 2020

thumbelievable 

Thumbelievable is what you exclaim when you receive an especially good hand job.

Stacy had a thumbelievable orgasm from Jeff after the concert.

thumbelievable by Torbert September 8, 2020

Humbelievable 

When something is sooo smelly, its humbelievable!

A combination of humming and the smell actually being believable.

Tom: "Pwoooaaar, when did you clean this flat?"
Ben: "Yeah... I have not cleaned it for decades!"
Tom: "It's HUMBELIEVABLE"

Humbelievable by tphere October 7, 2011