Is it ensure, insure, or assure?
psycho psy·cho (sī'kō)
A psychopath. adj.
: a special psycho channel that I know nothing aboutnoun
A crazy person; maniac; psychopath; nut: no buzzing broad, no nympho, no psycho, no bitch (1942+)
[probably fr psychotic; the form psychot, ''psychopath,'' is found by the 1940s]