I'm a colombian guy and I want to share with you all the colombian slang words that we use in our daily life!

¡Slang Colombia!

English: Buddy, pal 
Français: Mec, copain

!English: Oh my God!
Français: Oh, mon Dieu!

¡Ay, marica!: this expression is usually used in  really informal situations 
¡Ay, Dios mío!:  this expression is usually used  for elderly people and in formal situations

¡Qué vuelta!: this expression is used to expresss surprise, it could be like a sad surprise and sometimes you can also use it to express disappointment

1)Qué vuelta, mi novio me engañó con mi mejor amiga.

2)-Anoche me caí de la cama.
  -¡Ay, no! ¡Qué vuelta!

3) ¡Qué vuelta!, ya no confío en ti.

Original / pirata

Pirata: Yes! This noun means 'sea robber', but in Colombia we use it  all the time as an adjective to say that something is fake. If you want to say the opposite you should use the adjective 'original'

1) Compré un iPhone pirata.

2) No sé si mis zapatos son originales o piratas. 

3) Mi pantalón Gucci es original.

It's a contraction of the word "ya" and the passed form of the V "perder" (to lose) wich is perdió (he/she/it lost). 
We use this word "yaper" to refer to situation a situation in wich we can do nothing to change it.

Boté el celular en el centro. Yaper.  (I lost my phone in the downtown. Nothing I can do to get it back)
Mi papá perdió su vuelo. Yaper.  (My dad missed his fly. Nothing he can do