The answer is all very simple. A #squirrelTS is a dude you see on the street, in your every day life, that is one sexy fucker.
The photo can be shot candidly or a group selfie or what ever works for you. It just can not be a professionally shot photo or something you pull off of Tumblr or Twitter.
We are stressing that this is all amateur.
If you find yourself labelled as a “#squirrelTS” then you should take it as a HUGE compliment.