Well, “slithy” means “lithe and slimy.” “Lithe” is the same as “active”. You see it’s like a portmanteau–there are two meanings packed up into one word.
Rodolphus therefore finding such an earnest Invitation, embrac'd it with thanks, and with his Servant and Portmanteau, went to Don Juan's; where they first found good Stabling for their Horses, and afterwards as good Provision for themselves.
We're so bombarded with images, it's a struggle to preserve our imaginations.' In response, he's turned to cinema, commissioning 11 film-makers to contribute to a portmanteau film, entitled '11'0901' and composed of short films each running 11 minutes, nine seconds and one frame.