Similar to the word bullshit but in a sulkier content. It's something that sucks horrible. Bullshit is used as foul diction for something that is a bunch of nonsense and therefore you can relate bullsuck as its "sister" word, but not as profound. This word takes a lot of pressure built up from that disappointing moment and allows you to not feel guilty about your language, enabling you to achieve a sense of relief making you feel better in the end, so it's a win-win situation.
Bob: Hey buddy I'm sorry to tell you but hockey regionals are canceled for today.
Ned: Oh that is a bunch of bullsuck :( ......i was looking forward to this all year.
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.
FRIEND A: "Did you just take a stealthie of me?"
FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"