Urban Dictionary defines put out as the dispensation of sexual favors. Of course, that definition has nothing to do with this totally innocent retro-style design for back yard birders who enjoy putting out food for the birds.
You might be the most skilled birder in your bunch of birding friends, but how do you get that across without coming off as a prick? With your superior skills -- they'll see how good you are the more you bird with them. Even the greatest birder...