Sis
Sister
Example
Hey sis, can you pick me up after school 2morrow?
sis definition by Slang.net - The Slang Dictionary
This page explains what the abbreviation "sis" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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A common, playful abbreviation used for sister.
The abbreviation may be used to refer to a biological sister or your bestie. The term is similar to the bro abbreviation.