Ridden like a Shetland Pony

When your boss gives you a large amount of work to finish and an unreasonable deadline, you might aliken your predicament to a Shetland Pony being ridden by an overweight adult. Any reference to being whipped/flogged in addition is purely optional...

"Rio will you have time to fit some work in for me?"

"Not fuckin likely, il be dead honest, im getting ridden like a Shetland Pony today..."