Spanish slang phrases

I asked my friend Alejandro to send me some Spanish slang phrases:

Colega (friend)
Estar criando malvas (to be dead)
Dormir a pierna suelta (to sleep very well)
Echar una mano (to help)
Perder aceite, tener pluma (to be gay)
Dormir la mona (to sleep after to drink a lot of)
Pelar la pava (to make advances)
Faltar un tornillo, tener una gotera (to be crazy)
Flipar (to be amazed, to hallucinate)
Modorro (silly)
Dar de comer margaritas a los cerdos (to give something to somebody who don´t konw to value it)