Here are a few options, playing on different aspects of "tiresome":
Humorous:
* A bore-hog: This plays on the word "bore" and the pig's association with hogging.
* A snore-pig: This uses "snore" to represent being dull or boring.
* A grump-o-saurus Rex: This is a playful exaggeration, using "grump" to represent the pig's negative traits.
More literal:
* A troublesome pig: This is a straightforward way to describe a pig causing annoyance.
* A persistent pig: This suggests the pig is constantly demanding attention or causing trouble.
Ultimately, the best way to describe a tiresome pig depends on the context and the desired tone.