The word "尬舞" is formed by taking the character "尬", which is a shorthand extraction from the word "尴尬" meaning awkward or embarrassing, and directly combining it with the character "舞" meaning dance; the resulting compound literally signifies a dance that is awkward or poorly executed.
Word Definition - 尬舞
gà wǔ(slang) to battle each other in street dancing (derived from Taiwanese 較, which sounds similar to Mandarin 尬[gà]); (slang) to perform weird dance moves