Addicting.
I want to slap the person who first introduced this language virus to the world until all the skin and flesh has worn off their face.
We have a word for that concept already: "Addictive".
MrM2402, re: supermarket names ... I believe that particular one comes from shops traditionally having the name of the proprietor over the door, wherein adding the possessive suffix is perfectly valid: for examples just of the larger stores that are named this way thanks to starting from a grocers in some random high street, see Sainsbury's, Morrison's, Harrod's, Marks & Spencer's*, etc. Except along the line, all but the former have lost the apostrophe and the S has become a solid part of the word. It's then pretty much second nature to apply the same form to other names as if there's a Mr Asda or Ms Tesco out there in a lush care home, living high and wide off the profits of their village corner shop done good.
(Though, actually - ASDA is ASsociated DAiries, so ASDA's is a perfectly valid, if convoluted contraction; TESCo is a smashing together of {T.E. S}tockwell and Jack {Co}hen, so if you think of it as a shorter way of saying Stockwell & Cohen's, it still works)
* In this case, the "Marks" bit is singular, as in Howard Marks or whatever. Which means if Spencer were ever to quit, the somewhat dialectical shortening of the name to Marks's** like my Nan does would also be OK.
** The terminal "s" after the apostrophe was, of course, surplus to requirements, but included for clarity of pronunciation.
Also as I'm in the middle of the legal and documentation nightmare that is buying a flat, using some money that's a (very gratefully received) gift from a parent whose main response to Money Laundering legislation-derived questions is a repetitive "oh, I'm sure we don't have to tell them about that / the full details / that everything's changed, no-one will mind", I'm getting pretty sick of that kind of turn of phrase in response to what are actually fairly serious and adult concerns. Grow up, already. No, it won't be OK. Things won't always come out in the wash. This is the real world, with credit checks, criminal records and employers/lenders who will check one or both for decades to come. Don't be such a child/old lady.
(Pro-tip: yes, we do have to tell them, yes they will mind, not least the solicitor who has a duty to check all our finances before asking the mortgage company if they'll approve the loan, and is just as liable to prosecution as the rest of us if a random audit shows any kind of discrepancy between what was claimed and reality)
/dirty laundry mode
I and everyone I know says [aj-ik-tiv], as shown here: 
