A move during an argument or discussion whereby a person (almost always a woman) has absolutely no comeback and knows in a fair fight they're beaten, forcing them into a totally nonsensical, unrelated Hail Mary response. This strategy occurs when the person (almost always a woman) either realizes the other person is right and it's best to try to throw them off or when they're simply an idiot.
Fred calmly explained to his wife Mandy that her continued credit card expenditures at high end department stores would likely threaten the family's ability to pay their bills, and definitely end any chance of sending their children to college. Mandy, calling on the crown jewel of Desperation Debating replied, "Yeah? Well you have a small dick!
The act of someone writing "Thumbs up if..." at the beginning of their youtube comment as a desperate attempt to make their comments rank in the Highest Rated Comments, even though it gives them no real gain.
Acquaintances whom are used as a last option to call up to go out. These "friends" are being used so you don't have to go out alone.
Ugh none of my friends responded if they wanted to come out with me tonight. If I don't get a reply in an hour then I'm calling my desperation friends.
The act of turning a completely non-romantic situation into a romantic one because the person is desperate to feel as if someone actually loves them back.
"I think that cute cashier was flirting with me."
"Katie, I don't think someone saying have a nice day is considered flirting."
"No, he's definitely flirting with me. He gave me a bag."
"A bag to put your food in. You have severe Flirtatious Desperation."