emo attack
When a group of emos (usually more than the amount of people you're with) are walking towards you. 

It makes your heart jump... Are they going to throw tears at you? or perhaps their blood from cutting they keep in their manbags? But of course nothing actually happens and each group walks on to live another day. 
"shit shit shit, emo attack alert!"
"fuck, do you wanna go into that shop?"
".. nah, we'll be right."
*emo's pass, indifferently*
"phew.... "