E120 CREW MISINTERPRETED CTLR INSTRUCTIONS AFTER REQUESTED WX DEV.

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APCHING HOUSTON HOBBY; HOUSTON APCH INITIALLY GAVE US DIRECT HOU; THEN GIVEN A 180 DEG HDG 30 NM OUT OF HOBBY. NO REASON GIVEN WHY. APCHING WX CELL AHEAD; ASKED TO DEVIATE AND TOLD HIM WE HAD FIELD IN SIGHT. ASKED FOR L DEV AND WE HEARD 'R.' FO SAID HE HEARD DIRECT. STARTED L TURN DIRECT AND LATER CTLR ASKED ABOUT 'TURN R' AND WE STOPPED L TURN AND TURNED R. WITH CTLR USING NON STANDARD CALLS; AND US NOT VERIFYING THE CALL; MISCOM OCCURRED. NO INCIDENT OTHER THAN INITIAL WRONG TURN OCCURRED. NO REASON GIVEN TO OUR 90 DEG TURN WHEN ON A HEADING TOWARDS THE ARPT FOR STRAIGHT IN APCH. I ASSUME IT WAS TFC; ASKING FOR A DEV DUE TO WX; PROPER TERMINOLOGY OF DIRECTION OF TURN TO A HEADING. A SHORT BRIEF 'R' WAS MISINTERPRETED BY ONE PLT AS DIRECT; WHICH WAS A L TURN. THE CALL SHOULD HAVE BEEN VERIFIED AND THE CTLR SHOULD HAVE ADVISED US WHY WE'RE VECTORED AWAY FROM THE ARPT INTO A WX CELL. I BELIEVE THIS WAS A MISCOM AND THE L TURN WAS MADE. WE WERE GIVEN A HEADING FOR RWY 12R AT HOBBY AND LANDED SAFELY. SUPPLEMENTAL INFO FROM ACN 406560: I TOLD THE CAPT TO ASK FOR A L DEV. THE CAPT ASKED HOUSTON APCH FOR A DEV FOR BUILD-UPS. APCH SAID 'WHICH WAY.' MY CAPT SAID WE WOULD LIKE TO DEVIATE TO THE L TOWARD THE ARPT. APCH RESPONDED QUICKLY WITHOUT STATING A CALL SIGN; 'GO R.' THE PROB WAS ATTRIBUTED TO THE FOLLOWING FACTORS: CONGESTED AIRSPACE; TSTMS IN THE VICINITY CAUSING DEVS; HOUSTON APCH NOT USING A CALL SIGN ON ALL OF HIS XMISSION WHEN HE WAS TALKING TO THE SAME ACFT; HOUSTON APCH NOT GIVING ASSIGNED HEADINGS TO DEVIATE TO; AND THE FLC NOT VERIFYING THE CONFUSION OF THE DEV CLRNC RECEIVED. IN THE FUTURE I WILL BE SURE TO VERIFY ALL COMS THAT CAUSE DOUBT BTWN ATC AND FLC MEMBERS.