"Slag stabber jabbers" is an objective in the quest The Hunger Pangs in The Horrible Hunger of the Ravenous Wattle Gobbler DLC
To move things forward, you must have a Slag weapon equipped be it a gun or a grenade. If you don't have one, there is a slag weapon stashed in an oven past the stabber jabber nests. Hit the Stabber Jabber with it. While they are slagged you need to kill them. This will cause them to drop the Poison Gland you are after. You need to kill 3 of them to get the total glands you are after.