I've been trying to think about what annoys me about this, as opposed to just making me roll my eyes and dismiss it as another try-hard hipster stunt (and god knows the area is awash with those).
Ultimately I think it comes down to the fact that you wouldn't call a restaurant 'cocksucker'. Which is the direct comparison. So you have to think about why you get away with this, and all I can come up with is that its because female sexuality is belittled to the extent that its seen as non-threatening, and commodified to the extent that this is seen as the norm. This is clearly designed to elicit a snigger, and a bit of a 'ooh aren't they naughty,' carry-on-film, retro vibe that might get them some extra attention. 'Blow Job' or 'Cocksucker,' even if you found a cunning way to spell them, wouldn't get the same reaction.
It reminds me of katy perry's I kissed a girl song, which really irritated me when it came out - the same oh aren't we controversial, knowing wink, while actually selling something incredibly palatable: the idea that women aren't sexually experimenting because they want to but to titivate their boyfriends. And yes, its ridiculous to overanalyse a crappy pop song, or yet another pop-up restaurant concept that probably won't last long, but I think it reflects the culture we live in, and its going to piss me off every time I walk down my local high street, so I reserve the right to overanalyse to anonymous strangers on the internet to my heart's content.