OP here. At the moment, there isn't such an option built in, but removing the friend "pugomatic" on Snapchat directly will do the job.

If anyone has any concerns along these lines, or any other comments, feel free to drop me an email at tim@pug-o-matic.me.

Uh you have to accept whatever account it's coming from from your phone (e.g. the friend you send it to) before they actually receive them.