I'm sure this isn't what you're looking for but once they've had far too much alcohol, many people are prone to throwing their arms around other people and happily slurring "I love you. You're my best friend!"
Anyone fancy a pint?
Shall we go for a quick bevy?
Who's up for a quick one after work?
Do you fancy a drink?
Let's get hammered!
We're going out on the p*ss tonight.
Do you fancy a tipple?
Oh. OK. That wasn't clear, you're right. When making a toast or clinking glasses, instead of "Cheers", we say:
Up yours! (Careful, this can be construed as rude.)
At a wedding etc, you repeat whatever the words of the toast were, usually something like "To the bride and groom" or "To Jim and Sarah" (or, of course, any combination of male and female, male and male or female and female names").