"Giddy excitement" means feeling extremely happy and enthusiastic, to the point where you may feel light-headed or unable to control your excitement. Full definition
Side note: It looks bloody awesome.This week Mike & Dede put 2015 in the rearview mirror and start looking forward with giddy excitement to their most anticipated films of 2016. (filmthrills.com)
The pitch for a belated sequel to 1994's «Dumb and Dumber» with the participation of Jim Carrey and Jeff Daniels, as well as directors Bobby and Peter Farrelly, came with a mixture of worried trepidation and ridiculously giddy excitement. (kibsreviews.blogspot.ru)