when a guy has a huge penis and is so big it can't stand up so it hangs out from the guys body like a horse's penis does
yo i saw marc's cock and he's definatly horse hung
by brian January 20, 2004
A penis that is extremely large.
I was bad last night. I got tipsy and next thing you know I got myself involved with this one night stand. The problem was he ended up being so horse hung that today I can barely move.
by TheBigCanucklehead March 14, 2015