This "salad" was popular with bachelorette parties in the 1950/60's...you would make a notch in the banana, and have a trickle of mayo from the tip.
Now they give it to working class black kids.
Was this from the 70s? I wonder if Willard's unexplained banana/vacuum attachment sex potion from Dirty Duck was a parody of this at all. If not, I don't care, it still makes it funnier.