from Wiktionary, Creative Commons Attribution/Share-Alike License.
superlativeform of groggy: most groggy.
Sorry, no etymologies found.
If I asked at the right moment, when she's at her groggiest, she would be more likely to give me a handout, I figured.
But how highly placed the hostile individuals are in their government (if they have anything corresponding to government as we know it) "I haven't the groggiest.