what does that mean?

Kimochii means "feels good"
saying agu moche out loud sounds like it. I bet that's what you heard
 
Hahahahaha, "agu moche." I'd cry myself silly laughing if a Western porn star filmed in a JAV and said this in an effort to say "aa, kimochi ii."

"AGU MOCHE ... AGU MOCHEEEE!"

lol