Way to much information. Often used by women(and somethimes men) to pronounce that something is indeed gross or sickening and they dont want to hear anymore of what the other person is saying.
Person1: Hey dude i just wordgibbeword that guys ass~!2~@`;;;~1!^_^
person2: wordomfgword wtmi~!2~!2@~1;;>_<
Short for WAY too much information
Someone the other day was telling me something so graphic about thier personal life and I said to myself "WTMI".