otkidati

1. to tear off; to break off; to pick off
   Dete otkida komadiće hleba i baca ih golubovima. — The child tears off bits of bread and throws them to the pigeons.
   Nemoj da otkidaš cveće u parku! — Don't pick the flowers in the park!
2. (otkidati se) to come off; to break off
   Sa ove jakne mi se stalno otkidaju dugmad. — The buttons keep coming off this jacket.
3. slang (often + na + acc.) to be crazy about; to go wild
   Ona otkida na tu pesmu. — She's crazy about that song.
   Publika je otkidala celo veče. — The crowd went wild all night.

The perfective is otkinuti.