ચીબાવલા થવું ને ડોળ કરવા.

cībāvalā thavuṁ nē ḍōḷa karavā.

Literally: To be precocious and put on airs.
What it means: Said of someone who behaves in an overly smart, affected, or pretentious manner without real substance.

Also said as

ગુજરાતી કહેવતસંગ્રહ (Gujarati Kahevat Sangrah) (1923) ગુજરાતી કહેવતસંગ્રહ (Gujarati Kahevat Sangrah) (1921) · read from the scan by machine — the Gujarati itself is unchecked · English is machine-made and nobody has checked it yet

Heard it differently, or know we've got the sense wrong? Tell us — that is exactly the kind of correction this needs.