Secret Code popped up after beating the hell out of computer on Samurai Shodown IV

[complexs6]

Hey guys last night I brought my supergun to my friends house and while I played the computer I kicked the hell out of them and it popped up a code, The only thing I remember seeing was a few UP's maybe a DOWN and the Button C. I was ukyo and it happened twice both times I was kicking the oppenents @ss and at the end of the round it popped up in the middle of the screen. Saying "Secret Code". If anyone knows this code and can give it to me, I would really appreciate it. I feel so pissed it went by so fast twice and I didnt get a chance to get it down.
Help please.

 

[Mushiki]

d, d, u, f, f + C

It's the fatality code. You must input as soon as it pop ups for your character to perform a fatality.