風筒 (fung1 tung2) — a speed trap (because a radar gun looks somewhat like a hand-held hair dryer) in Cantonese
fungˉ¹風tungˊ²筒简 风筒
Mandarin Pinyin: feng1 tong3
Meaning of 風筒
nouna speed trap (because a radar gun looks somewhat like a hand-held hair dryer)
nounelectric hair-dryer [華]: 吹風機
noun(noun) a hair dryer; a blowdryer