Melting Pearls 

It is the process of ejaculation onto your own stomach. The resulting mess resembles a pearl melting.

I may be a little late for the party, I'm busy melting pearls at the moment.

Melting Pearls by Starxy June 14, 2015

melting pearls on my tummy 

Spanking the monkey. Masturbation.

"Well, I'll be upstairs melting pearls on my tummy if you need me." Roger on American Dad

melting pearls on my tummy by tibu March 9, 2012

Melting pearls on my tummy 

How ejaculate might look on one's stomach after masturbating.

American Dad - Season 7 Episode 9 Rodger says "I'll just be upstairs melting pearls on my tummy if you need me."

Melting pearls on my tummy by stevezoob June 9, 2012