splitting headache(redirected from a splitting headache)
A very intense, painful headache, i.e., one that makes one's head feel as though it is splitting apart. We were up all night drinking cheap wine, and I woke up the next morning with a splitting headache. I've had this splitting headache for nearly four hours, and nothing I do seems to help.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
Fig. a severe headache, as if one's head were splitting open. I'm sorry, I can't. I have a splitting headache. Maybe Fred will play bridge with you. This splitting headache has been going on for hours.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.