'SK' is and abbreviation for 'Sick cunt' or 'Sick kunt'.

A slang abbreviation used by people mainly in Australia and New Zealand.

The horrible moment when you realise that you have accidentally done something very slightly wrong which has very bad (usually embarassing) implications for you. This is typically the moment of realisation that you just sent a dirty text message to a close member of family, typically your mother, rather than the intended recipient.

An abreviation, short for the SKS. A semiautomatic rifle that is easy to convert to fully-automatic. A favorite of old school gangstas as it was invented around the same time as the AK-47

Or just sk, abbreviation of "it's ok" or "that's ok".

Abbreviation for Snitch Killer.

"SK" is one of the most popular ASMR triggers that is often whispered repeatedly in many ASMR videos.

The trigger was initially introduced and used by YouTube ASMR star Heather Feather. Since then, the trigger has become widespread across all ASMR videos, and—if used correctly—can put anyone into a total relaxed state of tranquility.

s'k means its ok