Describes a perosn, which can't keep still.
"Du bist so ein Zappelphilipp." - "You are such a Zappelphilipp."
"Deine Mudda ist so fett, dass ihre Badewanne ein anerkanntes Meer ist." - "Yo Mama is so fat, that her bathtube is an accepted ocean."
"Lauch" describes a person, which has no muscels and is a little bit nerdy.
"Jonas ist so ein Lauch" - "Jonas is a Lauch"
A person which is called "Digga" is your bro, who is also a gangster.
"Meine Exfreundin ist eine Fotze!" - "My ex-girlfriend is a fucking cunt!"
When you call something "geil", it means you like ist very much.
Can also be used, when you find someone sexual attractive.
"Mann, ist das geil!" - "Oh man, thats geil (amazing)"!
"Ich finde dich geil!" - "You're very attractive"