મેવાળાને શેરડો ન જાણે ને મારું નામ પગી.

mēvāḷānē śēraḍō na jāṇē nē māruṁ nāma pagī.

Literally: Not knowing the lane to Mewar, yet calling oneself a tracker.
What it means: Said of an ignorant pretender who boasts of expertise in a subject he knows nothing about.

Also said as

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.