EHCT

Abbreviation of "Emacs Has a Command for That."

Emacs, the extensible text editor is famous (notorious) for its extensive (bloated) feature set; to the point that there is an XKCD comic about it.

eyre: I just wrote a handy Perl script
eyre: it turns the error logs into a list of faulty HTML files.
slaine: doh
slaine: ehct
eyre: wat ur kidding
slaine: lol next time check emacswiki first

avi

Slang abbreviation for "avatar."

Avatar is the technical name for the "profile picture" that is typically part of your social media profile — the picture that shows up on your profile, next to your forum posts, etc.

your avi is relevant af