(pûrk) v.i.
1. To recover one's spirits or vigor: with up.
2. To carry oneself or lift one's head jauntily.
—v.t.
3. To raise quickly or smartly, as the ears: often with up.
4. To make (oneself) trim and smart in appearance: often with up or out.
—adjective Holding up the head smartly or jauntily; pert: also perk′y. [ME perken,? <AF perquer perch, roost]
—perk′i·ly adverb
—perk′i·ness noun

(pûrk) v.i. Colloq.
To percolate. [Short for PERCOLATE]