Definition: Okay, here's a short rhyme fitting your criteria:
(Geezer - (dated in US) A male person.)
My grandpa’s a geezer, quite stout and slow,
He chases pigeons with a brightly lit glow.
He wears argyle socks and a bewildered frown,
And argues with squirrels all over town!
And argues with squirrels all over town!