To descibe something disgusting.
"My mums b/f stole the camera from me cause he didn't want me to see the naked pics of my mum....that's so OMFG YEECH!!"
by Fox April 01, 2004
2 more definitions
Greeting used to define extreme shock and astonishment when talking to a friend.
by Fox February 17, 2004
The area between the anus and the vagina/testicles.
If you think my ball sweat is bad, smell my yeech.
by Peter Pants April 22, 2006