Literal translation
to touch the five sardines
Meaning
to shake hands
Explanation
A vivid variant of touching the hand: the "five sardines" stand for the five fingers, both for their shape and for a joke about how sardines wriggle, are greasy, and don't stay fresh-smelling for long. A fat person is also called es un barriéu de sardo, "a barrel of sardines": the idea of grease lingers underneath. A shorter form: "I touched him five of them".