It’s not just a hit song by Tiny Tim, it’s when you insert your toe between the two lips of a woman’s vagina. One can insert the whole toe, or just the tip. May also refer to the lips of the mouth.
When Tiny Tim slips the tip of his toe through Big June’s pussy lips, he is tiptoeing through the tulips.
Someone who is addicted to obtaining money and building wealth. A money addict and fanatic. Breadheads often work more than one full-time job, and some even participate in illicit activities to "obtain the bread".