Overview
A quick guide on how to bind emotes.
Console Commands list
Bind a key to display an emote icon over the marine’s head. With the exception of the “out of ammo” and “anime smile” emotes, all of these can normally be accessed through the radial communications menu.
bind <key> “cl_emote #”
Replace # with one of the following:
0 – Medic!
1 – Out of ammo
2 – Smile
3 – Hold position
4 – Follow me
5 – Be careful
6 – Anime smile
7 – Ready?
(Quoted from wiki just posting it for quick refresher)