1) A penis, or anything associated with penises, such as testicles, semen, urine or pubic hair. (this reference appears in just about every posting by the Loser, who will vehemently deny being gay, despite having an obvious and disturbing obsession with the penises of other men.)
2) A "hot" female, or any part of her body. The female's sole purpose is to inevitably get "fucked" or desired to be "fucked". The Loser cannot figure out any other use for a beautiful woman, and indeed, has no experience with beautiful women anyway. (Thinking about beautiful women is not encouraged since it only takes away from the precious time needed to consider the penises of other men.)
3) Anything related to beer (but not other forms of alcohol), professional sports, red meat, the military strength of the American Armed Forces, or anything else considered "manly" by the Loser.
4) The word Fuck, usually repeated many times and in many variations.
They have nothing better to do than insult people they hate via UD and this is what makes them losers.