[ganomi]

The /s stands for sarcasm

[skrebbel]

No it doesn't, it stands for "This used to be sarcasm but I ruined it by telling you"

[MaxBarraclough]

People use it for a reason. Intended tone does not carry reliably over text.

[kbenson]

I've always wondered whether /s predates, was a concurrent development, or is an evolutionary shortening of </sarcasm>.

[mcbits]

The history went something like this:

    jk
    </sarcasm>
    <sarcasm>...</sarcasm>
    </sarcasm>
    /sarcasm
    /sarc
    /s
    \s

[iddan]

⸮ https://en.m.wikipedia.org/wiki/Irony_punctuation

[izzydata]

This punctuation is very ironic.

[joejerryronnie]

It also stands for "hitting over head with hammer"