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 person with a small dick
jack you have a small dick