Pronounced as "goon-tow-bu" (noun).
Etymology: Vulgar Hokkien, usually used by some wako kia (people belonging to the lame bloodline)
1 : hand clenched with the fingers doubled into the palm and the thumb doubled inward across the fingers - fist
Usage:
1. His guntaobu was so hard it smashed the enemy's skull
2. Want to eat my guntaobu anot? (Used by typical cannot-make-it singaporean ah bengs, meaning daring a fight)