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1.
Refers to instances where between encounters with a person, you notice that they have put on a considerable amount of weight in circumstances where it is only possible for that person to have eaten a substantial amount of food. The only way to get so large is for that person to have gotten 'on the meal' or 'hitting the meal'.
Wow look at old Alison, she looks like she's been on the meal.

Q) Have you seen Janet recently?
A) No.
Q) Yeah well she's massive. Must have really been on the meal quite a bit.
by Refreshment Boxx November 02, 2013