lmkw

"Let me know when". Extends the common im-speak to include "when", a common modifier for things that someone would let you know.

Alice: "coffeetea?"
Bob: "sgtm"
Alice: "lmkw"
Bob: "now's good"

snark hat

A metaphorical 'hat' worn when a not otherwise snarky person wishes to add some snarkiness to the world. The un-snarky person can then remove the hat and return to normalcy.

Hubert was generally a nice and non-judgmental guy, but sometimes when he put on his snark hat he could really lay into people.