A guy who seems sweet and kind because he flirts and gives you unwarranted attention, but who is actually a creepy predator/pervert on the prowl for some new (usually young) girl of whom he can take advantage. A groundhog spends the majority of their time being an underground gets labeled as such because of the amount of time they remain underground sleezes. The best defense against groundhogs is to chase them out of their holes and expose them.

A person who gets the vaccine and and flaunts it will high end shopping, trips, and parties

The point of having to poop so bad that it starts peeking out of your butthole, like a groundhog peeking out if it's hole, and you have to squeeze it back in to hold it until you get the restroom.

A really fat person in Walmart who has sat down to look at a item on a bottom shelf and is blocking the whole isle. they usually cannot stand back up after sitting down

when you have to take a huge shit, and you are at a place where you cant. The shit resembles a ground hog as it constantly pokes in and out of your ass.

Doing anal sex with someone while giving them a swirlie.

An out of shape person who joins a gym or exercise class in early January as a New Year's resolution to lose weight. They give a half-hearted effort for a few weeks and by February 2nd ( Groundhog Day ) they haven't realized any loss of weight or size and become disenchanted and give up.