Poner la guinda al pavo

[ROBINDESBOIS]

English?
Rematar alguna treta, salir con una artimaña para despistar.

[Rusty]

poner(le) la guinda =
add the finishing touch(es) | add the crowning touch
top it off | cap it off
put the icing on the cake
put the cherry on (the) top

I didn't see anywhere where adding 'al pavo' to the saying changed the meaning. Am I mistaken?

[poli]

I think this may mean throw to throw in a red herring.