chimpo.html

<script type="text/javascript" src="chimpo.js"></script>
<button onclick="chimpo()">「ちんぽ」表示</button>

chimpo.js

function chimpo() { alert('ちんぽ'); }

chimpo_data.html

<script type="text/javascript" src="data:text/javascript;charset=utf-8;base64,ZnVuY3Rpb24gY2hpbXBvKCkgeyBhbGVydCgn44Gh44KT44G9Jyk7IH0="></script>
<button onclick="chimpo()">「ちんぽ」表示</button>