death eating crackers 

When you just feel bad in general and cannot pinpoint the source. You have no symptoms of sickness such as a runny nose or nausea, but you really feel terrible.

I'm afraid I won't be bushhogging the field today, Betty. I feel like death eating crackers.

death eating crackers by Playon September 4, 2006

Death eating a cracker 

A person who is too thin

That anorexic model looks like death eating a cracker.

Death eating a cracker by Pittguy1971 June 20, 2015