It's robić loda as an infinitive verb and robienie loda as a verbal noun, if anyone's wondering. Polish apparently has a number of other terms for blowjobs, too, as one might expect, which are considerably less interesting.

Incidentally, there is no Wiktionary article for the word "pitjob".

Edit: Alright so I went to the Wikipedia article for armpit fetishism and found that apparently armpit sex is called "bagpiping", and indeed on Wiktionary the third sense listed for "bagpipe" as a verb is the sexual meaning, so at least there's that... Incidentally, the Wikipedia article for armpit fetishism is one of the few sex-related Wikipedia articles that's actually gotten me to snicker a little, just because of the captions under the photos, and because of the very unexpected lone example the article provides of armpit fetishism "in popular culture".