砍刀 (machete / kǎndāo) is a large cleaver-like cutting tool, frequently used to cut through rain forest undergrowth and for agricultural purposes.
Why it is blocked: Knife and cleaver-wielding men attacking schoolchildren became an unfortunate phenomenon in China in 2010. However, none of these cases specifically involved machetes, so it may simply be a matter of Weibo’s general block of most weapons. [Status - 2/9/11: blocked]
