tummy rubbing
n.— «One top Port of Seattle consultant and construction contractor had their own shorthand—”tummy rubbing”—for informally negotiating how much the port should pay for unexpected work at the airport, a recent state audit found.» —“Chummy culture at port costs taxpayers” by Jennifer Langston Post-Intelligencer (Seattle) Mar. 2, 2008. (source: Double-Tongued Dictionary)