Many Shanghai drifters only get back to their hometown once a year, at Spring Festival.
Tips
usage
Formed on the pattern X漂 meaning 'drifting/rootless in city X'. 沪 is the classical abbreviation for Shanghai. Compare 北漂 (Beijing drifter), 深漂 (Shenzhen drifter). Often self-deprecating but neutral in register.
memory
沪 = Shanghai (you'll see it on Shanghai license plates), 漂 = to drift. Literally 'drifting in Shanghai'.