prank
(literally: glue)
Example
El niño era insoportable: timbraba en todos los citófonos de un edificio, hacía pegas por teléfono a los bomberos y se colaba al cine de barrio sin pagar.
The child was intolerable: he would ring all the buzzers in a building, make prank phone-calls to firemen, and sneak into the neighborhood movie theater without paying.
Meanings of pega elsewhere: job (Chile, Cuba, Bolivia); obstacle (Spain); payday (Venezuela)
Colombian Spanish - Slang and Vocabulary 