SLY
SLY definition by Slang.net
This page explains what the acronym "SLY" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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SLY stands for "still love you" or "still loving you." It is a quick way to tell someone you still hold great affection (romantic or platonic) for him.
SLY is obscure and mostly used by slang-savvy teens and adults to save time and characters when texting or online, particularly on social media. People may send it as part of a sentence or as a standalone response to remind a person that they love them.