licking one's chopsticks
A specific breach of Japanese table manners; considered rude and unhygienic.
Licking your chopsticks is an act to avoid as part of dining etiquette.
Common spelling using kana for the verb part and kanji for 箸.
Kanji spelling using 舐る (to lick); less common and may be harder to read.
Compound of ねぶり (continuative form of ねぶる, 'to lick') and 箸 (はし, 'chopsticks'). The reading ねぶりばし results from rendaku.