The male equivalent to a "Debbie Downer"
A man who says negative things during a positive event, thus bringing down the high energy levels or good vibes all around. This negativity tends to make others feel like shit or infuriated.
Bruce: This party is wild! The girls are hot and the beer is cold!
Larry: Not as cold as my blue balls! Let's face it, we're never gonna get laid tonight and beer causes liver problems...
Bruce: Damn it! Stop being a Donnie Downer!!!