It means uncle, although in anime character regularly use it in its less formal form where it functions more as "mister" or "sir." It's just an informal, but not necessarily rude, way to refer to an older man than yourself that you're unfamiliar with.
That's all I wanted to get clear. Most definitions stop at uncle and barely explain the secondary, and probably more common, use for it. "Ojisan" always means "sir/mister" unless they're actually they're uncle.
Very Handsome And Strong Family
There are no gays in the family and only straights. Most of the Ojeda’s have six packs
So be careful around them. They are true and loyal to friends and can run at high speeds
They are Proud Mexicans. They are nice and out going and love to play sports
P1: who is that?
P2: that’s an Ojeda
P1: damm they are very big and sexy
P2: I know they get all the bitches P1: damm I guess all the Ojeda’s get the bitches