squid pro quo 

A thriving barter system in very isolated communities, involving the exchange of mollusks for other goods.

That exchange was totally squid pro quo, I gave him some squid and he gave me some tentacle videos.

squid pro quo by Kuroko September 19, 2003

Squid pro quo 

The exchange of calamari for sexual favors

Do you know any good seafood restaurans? I'm going to see if I can charm Debbie's pants off by offering her some fresh calamari , you know a little "squid pro quo"sexual harrasment seafood

Squid pro quo by Out my name February 7, 2017