Basically saying darn it or expresses feeling of regret or sadness
I tripped on the way down the stairs yam it! OrI just got sniped in halo3 in when I joined in the first 5 seconds yam it! Yam it I died in the wielderness in runescape and lost my full dragon my 100mill my pet and all of my good stuff. I just won the lottery but got robbed that same day yam it!