Based on Christina's Aguilera's song Genie in the Bottle lyric:
"My body's saying let's go. ... But my heart is saying no."
When something should begin at the very moment, but not all information is pointing to it being a good idea. It can also can mean that the information is not yet available, thus causing the hesitation.
Engineer: "Should I go ahead and proceed implementing this feature?"
Project Manager: "Not sure... I have to check with the client."
Engineer: "Ah another Aguilera Dilemma."