Labeling a person with the ability to get drunk on minimal alcohol. Usually ends up acting the most drunk from complete non-tolerance to alcohol. Can be used to define a male/female who pukes after 15 minutes of drinking.
Nathan: OMG, you're pulling a doonage! You've only been drinking for 15 minutes and you puked!
The combination of the first part of dude that makes the do sound and man which is changed to sound mane (like a lions mane) for more effectiveness in speech. Not meant to be derogatory. It can be used as a greeting like "Dude!" or as a replacement for a name (see examples).