Definition of SIS

The Meaning of SIS

You have found the definitive source for the meaning of SIS. This page contains all the definitions of SIS, crowd sourced, moderated and curated by real people who care about the true definitions of SIS.

The Top Definition of SIS

The most popular meaning of SIS is: sister

What Other Meanings of SIS Are There?

  1. Snickering in silence
  2. Add your own definition of SIS.

What is SIS?

SIS is sister

SIS Means

The definition of SIS is "sister".

SIS Definition

The meaning of SIS

SIS means sister.

Now you understand the definition of SIS - SIS means "sister".

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What does SIS mean? SIS is an acronym, abbreviation or slang word that is explained above. If you ever forget what SIS means, just come back to and we'll define any acronym you need help with.

  1. SRS - serious
  2. SIF - as if
  3. SAS - Smiling, Always Smiling
  4. SIU - suck it up
  5. SUS - See You Soon
  6. SS - screenshot
  7. SS - Selfie Sunday
  8. AIS - Ass In Seat
  9. S4S - Support For Support (MySpace)
  10. SIG - Signature
  1. DARE - Drug Abuse Resistance Education
  2. DFTT - Double Funbag Twin Theory The assertion that if o
  3. FSCK - File System (Consistency) Check
  4. IH8MLS - I hate my little sister
  5. ILYAAS - I Love You As A Sister
  6. ILYLAS - I Love You Like A Sister
  7. LOMG - what my sister just said on skype
  8. LUGLS - Love you guys like sisters
  9. LULAS - Love you like a sister
  10. LYAS - Love you as a sister