This animated GIF of the word Cum rotates so as to be read rightside-up and upside-down. English slang and offensive language. The topic of the ambigram is sperm (male semen), and has a link with sexuality.
<a href="//commons.wikimedia.org/wiki/User:Doxoc" title="User:Doxoc">Doxoc</a>
<span class="int-own-work" lang="en">Own work</span>