Here's why:
* Slang: It's a slang term, meaning it's informal and doesn't follow strict grammatical rules.
* Origin: It comes from the phrase "swollen," which is already a past participle.
Alternatives:
To express the past tense, you could use:
* Was swoll: This is the most common way to express the past tense.
* Got swoll: This is a more informal way to say it.
* Swollen: While this is more formal, it still conveys the same idea.
For example:
* "I was swoll after lifting weights."
* "My muscles got swoll after that workout."
* "My biceps were swollen from all the bicep curls."