Toast : v. tr. Toast, it's boire at the same time as someone, after having shocked the glasses.
Drink excessively.
Suffer an inconvenience; bail: toast for six months in jail.
Parents drink, children clink glasses.
Getting away without toasting: without being condemned.
Toasting: receiving blows. Being manhandled.
Toasting: receiving a volley.
Receive beatings or reprimands.
To beat, to mistreat (jargon of the thieves).
Toasting the navel: making love.
The origin of the custom of clinking glasses with glasses: Toasting by knocking glasses against each other is a custom that dates from the Middle Ages.
At that time, poisoning was a relatively common practice at banquets between competing lords, nobles and other notables. Some thieves also used poisons to kill and steal the fortunes of wealthy people, everyone was suspicious of everyone, and poisoning killings were common.
Thus, the great lords took the habit of clinking glasses, ensuring that a little of the content of each glass ends up in the other, thus showing that the liquids were not poisoned. The tradition has continued, even if we now have more confidence in each other.