A Dinabeer is a drink (usually a beer) that is discovered to be still mostly full. This typically happens when cleaning up from a party the next morning. Dinabeers are especiallyannoying because instead of just dumping all the cans/cups into the trash, you have to pour out the warm, wasted beer.
Dude, the drameter was registering a 9.5 out of 10 when Joe confronted Suzie in front of all of us at the dinner table about her cheating on him. You totally should have been there