Did ya shift him/her last night? Meaning did you kiss him / her(tongue action involved!)
You shifted the face of him/her last night (You were kissing him/ her passionately last night!)
The "Shift" is when a guy (sometimes a gal) goes from DFS to DFL. Sometimes it happens because he has been dating seriously and sees the long-term potential or possibly has experienced lovematism. Sometimes it happens because he is bored with superficial one-night-stands or FWB and wants to settle down with one woman.
The "Shift" is when a guy leaves the dateship boards the relationship.