Performative utterances often take the form of declarative sentences with which the speaker performs the action denoted by some performative verb (e.g. promise, declare etc.). In so doing, the speaker does not describe the world but changes it.
If I told someone "screw you," am I doing a performative utterance? By saying "thank you," I am doing the action of thanking, but I'm not sure if the same can be said for "screw you." I'm not sure if "screw" can be defined as a performative verb based on the following criteria.
Performative verbs are verbs that describe actions carried out by speakers.
They are used in 1st person singular, simple present, indicative, active.
They can be combined with hereby (cf. Bublitz 2009:75f).
The main problem is the last one, where I'm not sure if "hereby" can be used with "screw." It also doesn't seem to fit the earlier statement of "In so doing, the speaker does not describe the world but changes it." Saying "screw you" doesn't seem to change the world.