1 definition by Saikoesis
The "under" is the person at homosexual methamphetamine parties that is so lethargic and strung out from shooting up, that he ends up being at the bottom of the orgy pile at all times, constantly getting railed.
The new strain of AIDS discovered back in September was traced back to a male who was the under at homosexual party.
by Saikoesis June 9, 2005