Dictionary.com
definitions

schtup

or shtup

[shtoo p]Slang: Vulgar.
verb (used with object), schtupped, schtup·ping.
  1. to have sexual intercourse with.
verb (used without object), schtupped, schtup·ping.
  1. to engage in sexual intercourse.

Origin of schtup

From the Yiddish word shtupn literally, to push (in), press
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018