Code: Select all
\documentclass{article}
\newenvironment{thingy}{\noindent}{}
\begin{document}
\begin{thingy}
testing testing testing testing testing testing testing testing testing testing testing testing testing testing testing testing testing testing testing testing testing testing testing testing testing testing testing testing testing testing testing testing testing testing testing testing testing testing testing testing testing testing testing
\end{thingy}
\end{document}