Typically this feeling occurs when they do something stupid or adorable, also can occur when they fall asleep with their head on your lap.
It can be manifested as:
1. Wobbly stomach
2. Weak knees
3. Heart skips a beat
4. Warm and fuzzy feeling
Luckily this is not a fatal condition and requires no special treatment.
“I got the oogely boogelies when we were spooning last night.”