4L
For life
Example
I'm a Toyota guy 4L; can't beat them for reliability
4L definition by Slang.net - The Slang Dictionary
This page explains what the acronym "4L" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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People use 4L (for life) to succinctly express their love for a person, group, or item. For example, a T Swift fan might post "I'm a swiftie 4L; doesn't matter how mid her next album is" to express their undying devotion to Taylor.
On social media, you might encounter 4L in users' usernames, when they've named their account after a thing they love. A user whose username is AvacadoToast4L, for example, is likely really into avocado toast.