I have been struggling to find a meaning for なめるな. The word seems to have the effect of asking people to shut up, but this is just a guess.
It appears in a news story about someone's twitter comment, from last year.
The last few bits of the comment are:
いつもいつも私の仲間に迷惑なツイートをしてくる人に言います。私の何を知っている。なめるな