The horn just means you have the fucking horn! Having the horn refers to a want in sexual desire. The horn-bearer wants it. Sluts have the horn and will take such horn. Most guys have the horn as general rule. If out at bars its always a horn-off, (often referred to as flirting), yet one must be cautious in horn judgement as its never true love. The horn for males can extend to various and great lengths.
An extremely serious medical condition, in which the sufferer is compelled to Jack Off. This is a very dangerous condition that may lead to death, possibly by drowning in Jizz. The affects of this condition can last for up to 2 weeks. Scientists are working of a cure, but as of yet there is no cure or treatment.
The feeling you get before you decide to beat off. Usually with following up to the beating of the dick unless there are people around in which case the horn increases until you can't take it anymore.
Bob-" Hey man what's with you? Your face looks all weird."
Lil JJ-" Yo I'm in the horn right now son. I think i need to use yo computer for about 15-20 min."