Do not attempt an Italian meringue buttercream frosting (with rum) when the temps are in the upper 90’s and the humidity is palpable.
Also note that putting soupy Italian meringue buttercream frosting (with rum) in the refrigerator will thicken it up, but not in time for the party that begins a half hour after you discover that Italian meringue buttercream frosting (with rum) won’t take in your sauna- esque kitchen.
Also note that Italian meringue buttercream frosting (with rum) tastes quite good soupy, slightly thick, and been-in-the-fridge-since-yesterday thick. Failure to have useable icing for my party yesterday just means more for me.
Reit This Way 
Do you have strawberries? Sounds like a match made in heaven!
I agree with Charlotte!! Scoop that up with something sweet and call it a day!! And it's hot as you-know-what here, too. But hubby is home for his visit, so it's all good!!
It had rum in it, that alone makes up for its shortcomings!
PUT THE FREAKN AZ WHEN YOU ARE COOKING…
I meant to say AC… forgot my glasses…. ha ha