usr.verbs += /mob/secret/verb/BLAH

Don't forget to set a variable when you get the verbs, because they're not saved. Also, if you want to just have verbs that you can use with items, just apply the verb to the item instead of the person, and you can use it if it's in your inv. Set set src in view(1) to make it so you can use it if it's in your inv or not, use set src in oview(1) to have it so you can use it if you can touch it, but not if it's in your inv (for pick up verbs), and so on, not supplying a number just lets you use it when you can see it.