Someone who steals for petty reasons, which technically is theft in general, because any authentic justification of theft would disqualify it as theft.
A "real thief" is theoretically, according to this logic, someone who only steals from petty thieves. But a petty thief is just as capable in principal of stealing from a "real thief".
Someone who committed the crime in which the fecal matter of another is intentionally and fraudulently taken without permission or consent, with the intent to convert it to the taker's use (including potential sale).
"Barry Mc. Hawk was charged with potty theft in connection with the reported loss last month from a local households' bathroom. He is now, a Potty thief.
When one engages in a bash and dash and upon leaving they exit with the hosts house cat or small dog.
Shane was so horrible in bed that while making her leave, Nancy grabbed his beautiful cat, Chuckles performing a picture perfect bash and dash with petty theft.