johnahan means in slang: Johnahan, the name refers to a man with **** hair who is god-like and can hold the ball of all the universe. His shaft may be bigger than Bill Gates’s. His style is very lady-pleasing and will ruin your girls’ ovaries by just sticking his tip in. Although he has no control over the number of ladies he draws, you can be sure that he will support your wife, husband, children, nephews, nieces, and all family members. Johnahan will swing for either team and please men if that is what he feels. (in Slang Dictionary, added by Ian Black)