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In some senses, geek is marked as dated, slang, colloquial. Watch for register when choosing this word.
ADJ.
complete, enough, high, right
I've always been a complete geek about vintage video games since childhood.
VERB + GEEK
go, saw, total, watch
I totally went geek over the new Star Wars movie when it came out last year.
GEEK + NOUN
alley, invasion, klingon, nerd, school
My brother spent most of his teenage years hanging out at the local geek alley trading comic books.
PREP.
in, up
My older brother really geeked up his computer setup with all the latest gaming gear.
ADV.
also, immediately, once, such
Once he became a computer geek, he spent every evening coding in his bedroom.