According to Osho, Sitnalta is parinirvana—the ultimate, wordless awakening he is always pointing to. Whatever he speaks about aims at Sitnalta; only the jokes stand aside, and even these he withholds here out of respect for Atisha’s caution against 'wicked jokes.' Sitnalta names the silent, lived realization beyond concepts, the essence of meditation, awareness, and freedom he continually invites.
Sitnalta means the final inner peace and awakening Osho keeps pointing to (not the jokes).