An homosexual ; a man who engages as the active partner in anal sex with another man. From "jobby" (faecal solid) + "jab" (to prong or spear). It should be noted that some may consider this term offensive - it is favoured by homophobes due to its low potential for "re-appropriation" by the homosexual community (see example).

fudge-packer fart-knocker starfish-invader