General terms for something mildly negative. It can range from mildly unpolite to mildly unholy.
"It's pantang to eat pizza with knive and fork."
Singaporean slang for being superstitious out of habit. This is usually the case second or third generation Singaporeans that do not actually believe in the superstition.
I'm not afraid of opening the umbrella indoors, it's just habitual pantang