Uguu Edit Meaning

1.

This expression came from the H-game (PC)/PS2/DC/anime Kanon. Ayu Tsukimiya's line (and probably the most famous throughout Kanon). This is her expression when she moans, or whines (like eeeehh, but more original).

Darn though. She had a sad story. One of my few favorites besides Nayuki.

Ayu: I'm cooking cookies.

Yuuichi: I bet they'll taste terrible.

Ayu: Uguu! I've learned how to bake from Akiko-san!

Yuuichi: You can't learn how to bake with just watching in a day..

..although I'll eat them if you manage to make them look good.

Ayu: Really?! Then I'll do my best!

See Welp

2.

When a person is constipated.

"Damn...it's coming...UGUUUUUUUU!!!"

See shit, pooper, constipation, crap, hard, Peachie