A jack is someone who is weak and skinny
Jack is weak he can’t lift a pencil to save his life
Is a adopted member of the pack, though he could go back to his flat he choses to stay with curtain group of creatures. He is mostly known for starting unnecessary water fights and sleeping in hallways he is also quite good at minecraft and will fight you for that title
Everyone: have we just adopted jack now?
Makes sick blends, either with a blender or by jamming out on a guitar. This wild animal may allude you for sometime and never seems to be in his natural habitat, but with the promise of food and tunes he always seems to make his way back to the jack cave
Jack: awwwww
Usually refers to someone who won't ever stop, or keeps harassing everyone.
"Stop being such a Jack!"
"Stop Jack!"
"Jack, dude, seriously, stop!"
A british jackass that annoys the fuck out of others, also known as Anon, will most likely lurk underneath your bed requesting to play video games
"That guy is such a Jack, look at him,"
"Oh yeah, he called me his m8 one day"
"he called me a faggot"
Jack is a sexy beast that can do anything he wants, when he wants including banging the hottest chicks
“Yo is there a earthquake?”
“No, It’s cause jack is here”