To pull out whilst receiving oral sex, cum on your girl's face, then throw a handful of icing sugar onto her face. The icing sugar sticks to the cum, and resembles a freshly iced cake.
Dicksmacker69: "I want to bake some cookies, have you seen the icing sugar?"

Troll: "Yeah, it's upstairs, your mom and I were Icing The Cake last night."
by Cockmongler6959 December 31, 2011
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When you go to a music festival or other event and they have grossly under-estimated attendance and massively skimped on port-o-potties. You enter for a #2. There is already a cone of scheiss adorning the seat, but you feel confident you can cast the last stone. With knees unbent and face to the door, you ice the cake with success.

Note: only one person can claim having iced the cake per port-o-potty; extra bragging rights if you wipe with a wife beater afterwords and swirl that around your prize to fashion it a makeshift crown of glory
When Mike finished icing the cake at Festeroo, he erupted from the port-o-potty exclaiming: "it's done, no more!"
by blessure grave February 25, 2010
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1. Turning a girl on.
2. Pleasing me.
"I like it, baby: you're icing my cake." (Follow with "steaming my clam", "relaxing my meat", etc.)
by meyk June 29, 2006
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the wonderful deliciousness that is chocolate ice cream on top of cookie crumbs on top of vanilla ice cream.
ice cream cake is bombbb!
by xooxbritt October 5, 2008
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Bad news/events that already top off an extremely shitty day
Mike: What's wrong Billie?

Billie: My girlfriend just broke up with me and now my car just broke down.

Mike: Damn, that must be the icing on the shit-cake.
by Whatsername1911 February 2, 2010
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The act of turning a girl on.
"I like it, baby: you're icing my cake."
by meyk June 28, 2006
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