Umptiply
Getting multiplied umpteen times. To be more precise multiply into undetermined or so many times. 'umpt'- from umpteen and 'iply' - from multiply.
Eg.

Marc: Hey when my mom said she is gonna get me a new bike.. You can't imagine how happy I was...

Neil: Dude you got to be really excited...then...!!??

Marc: My excitement has been umptiplied like crazy...

Neil: Umptiplied??

Marc: Yeah!! Umptiply.. is multiplied umpteen times...!!