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2.
When Law Enforcement SUDDENLY (therefore "INSTANT") becomes aware -- after the fact -- that many previous murders, probably stretching over many years time -- are actually the work of a SERIAL killer ("serial" sounds like "cereal" = "breakfast").
O'MALLY: Oh my God!

DRUMMOND: What O'Mally?

O'MALLY: Instant Breakfast, Drummond!

DRUMMOND: Are you sure? What cases are you talking about?

O'MALLY: Come here. I'll show you.
by Detective Baretta November 21, 2006
 
1.
A blow-job first thing in the morning.
I woke up this morning and gave my girlfriend an instant breakfast.
by nahead24 January 22, 2010