Definitions from Wiktionary (geek out)

▸ verb:  (intransitive, slang) To enthuse about a specific topic; to be engrossed in an interest, especially in discussing it with others.
▸ verb:  (intransitive, slang) To do geeky things; to act geeky.
▸ verb:  (intransitive, slang) To be scared, freak out, panic; to hesitate in fear.
▸ verb:  (transitive, slang) To scare or freak out (somebody).


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