Definition: Okay, here's a short, funny rhyme incorporating “spermhearder” as you requested, aiming for cleverness and light-hearted absurdity:
Definition not found.
My pet hamster, Pipkin, quite absurd,
Bought a tiny helmet – a spermhearder! Word!
He claimed it boosted his speedy run,
Though mostly he just looked like a glum little bun.
Though mostly he just looked like a glum little bun.