no one really knows the true meaning of this word, but usually mean something is messed up or can't be fixed
Anson: "I just yammed that test."

Lily: "My sleep schedule is yammed!"
by onethyfox October 22, 2019
Get a yammed mug for your sister-in-law Helena.
To be otherwise toasted, fried, or hit over the head with a very large textbook.
Man that teacher totally yammed us on the test.
by YAMICUS November 07, 2007
Get a yammed mug for your Uncle Abdul.
The act of licking another person from side to side along the longest part of each butt cheek without lifting your tongue. yam to yam Y2Y
Ray : Damn! Chema, let me go yam to yam!

Chema : Damn dog! From cheek to cheek? What if I clench?
by Saucy! September 06, 2018
Get a Yam to yam! mug for your fish Helena.
Person from the Black country which is in the west midlands, very close to birmingham. The Black country dialect is very unique. Yam yam derives from 'you am' e.g 'yam coming with me ay ya?'
A couple of drug smoking munch seeking yam yam's in a car:

"Yam gewin the wrung way! Where am yo gewin kid?"
"I ay at all!"
"Ye yam, yo day tek that last turnin ya saft get!"
"Oh arr, soz I day realise"
"yo'll atta gew back im starvin I cor wait no longer kid!"
by A drug smokin yam yam June 08, 2007
Get a yam yam mug for your guy Georges.
A person from the Black Country area of the West Midlands of England. Yam-yams use a slight variation of English that is often incompehensible to non-locals (and even to their neighours from Birmingham, with whom they share many similariies in vocal accent) due to both the thick accent of the speaker and the frequent exchange of standard words in place of local terminology (the most obvious example being the substitition of the word "you" for "yam").
"I wish these yam-yams would bloody learn some English."
by kipstik.FiL November 08, 2004
Get a Yam-yam mug for your dad José.