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Ala mode means "with icecream." Ala mode is usually used in the same sentence as custards and pies.
Friend: Hey can you get me a slice of apple pie ala mode.
Dude: Nah man, sorry we ran out of icecream. I can give you just the apple pie though.
by Luke F July 10, 2005
a) Fashionable; in the current style or fashion.

b) (US) Served with ice cream.
"we served the apple pie à la mode"
by Devilwymyn October 01, 2011