wait, what does this mean exactly? the stickman used their pgp private key to sign a text file that contains the girls public key? is this a taboo in the pgp world for some reason?
The joke here is that he has no idea who this girl is and yet he still signed her key. This is dangerous, because he is vouching for her identity. If he is mistaken, this could result in a serious loss of credibility on his part.