For those like me who want to call it from their zsh, add the following to your .zshrc:

explain(){ curl -s $(echo "http://explainshell.com/explain/$1?args=${@:2}" | sed -e 's/ /+/g') | sed -n '/<pre/,/<\/pre>/p' | sed -s 's/<[^>]>//g' | sed -e 's/^ //g;s/ *$//g' | grep '.' | cat }

and call it, for example like: explain git status -s