It's a good domain ... but I'm not sure who the end user would be. At first it seems like a great short brandable .. however I'm thinking "stab" isn't really a name most companies/start-ups would want to associate themselves with. So the number of possible buyers is limited ... but there are often exceptions .. I can't think of one right now though .. but it's a really good strong short punchy name if you can find an end user who's use of the name overshadows the criminal aspect of "stabbing" .. lol .. maybe some kind of app where you select something and they associate "stab" with "taking a stab" at whatever the focus of their app is ...
It's not a worthless domain .. but how much it's worth is really dependent if you can connect the term with an end user .. which in this case is more difficult than average because of the definition .. but not impossible!
negative meaning and sound of the keyword hence not most endusers would want to associate with usch a keyword or brand using this keyword, plus .co tld so low-mid $xx value IMO