From Lexicanum

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Psychic Vomit occures when a Wyrdboy can no longer contain the ork energies any longer. The psychogenic energy is vented powerfully in great green streams. ¹.

Wyrdboyz dislike being around other Orks as the pure energy given off unconsciously by other Orks can build up in them and eventually results in an 'Eadbang if it can't be discharged safely. Wyrdboyz discharge the energy in the form of a wave of energy erupting from its mouth much like vomiting fire. While the Wyrdboy feels a lot better for this, those around him are unlikely to feel the same way.

• ¹ GW UK's Ork page "Feral Ork Army List" (accessed 2007.02.19)