Combination of the expression "damn" and the game "dominoes". Used to describe a bad event/happening that causes another bad event/happening that causes another bad event/happening etc. etc.
Similar to a falling line of dominoes.
Homeless Fat Person: I am fat, so I ate too much fast food, which made me sick, which caused me to barf, which caused my apartment to smell, which made it uninhabitable, which forced me to leave, which resulted in me being homeless.
Passer-by: dude, thats damninoes. Here's a quater.