IASIP
It's Always Sunny in Philadelphia
Example
Can you believe IASIP is still on the air?
IASIP definition by Slang.net
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Patrons of Paddy's Pub know that IASIP stands for It's Always Sunny in Philadelphia. This long-running American sitcom stars The Gang - a group of weird "friends" who constantly belittle each other and engage in dubious activities (such as doing drugs, launching get rich quick schemes, and blackmailing each other).
Despite (or perhaps because of) its main characters' dysfunctionality, IASIP has a large, loyal following. In 2021, IASIP became the longest-running live-action American comedy, when its 15th season premiered on FXX.