your panties in a bunch.
Origin
The phrase originates from FunnyJunk. On June 16th, 2010, an image macro of a frowning gorilla with the overlaid text "That really rustled my jimmies" was posted by an anonymous user who has currently deactivated his account.[23] On July 18th, 2012, the image had an overall score of over 100 with nearly 7000 views. The original photograph of the gorilla can be found in a Flickr post titled "nors"[7] uploaded by Frank Wouters on July 4th, 2007.
https://knowyourmeme.com/memes/that-really-rustled-my-jimmies