I. gee 1 /dʒiː/ BrE AmE interjection especially American English
[ Date: 1800-1900 ; Origin: Jesus ]
used to show that you are surprised or annoyed ⇨ wow :
Aw, gee, Mom, do we have to go?
II. gee 2 BrE AmE verb
gee up phrasal verb British English
1 . gee somebody ↔ up informal to encourage someone to try harder:
The team needs a captain who can gee them up a bit.
2 . gee up! used to tell a horse to go faster