In a state of high excitement or extreme disturbance; very much upset: So Woody kept his voice down, but he was all shook up(entry form 1897+, first variant 1891+)
Very happy; exhilarated; high: I expected years in prison; they let me go free, boy was I shook up(1950s+ Teenagers & rock and roll)
[revived and popularized in 1950s by Elvis Presley]
The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D. Copyright (C) 2007 by HarperCollins Publishers. Cite This Source
Idioms and Phrases with all shook up
Greatly disturbed or upset, as in His letter left her all shook up. This slangy idiom uses shook instead of the grammatically correct “shaken” (for “agitated”) and adds all for emphasis.
[ Second half of 1900s