Chuck and Jill (Jordana Brewster) fake an engagement party in order to get Uncle Bernie (Ken Davitian) to show up without any bodyguards. Looks like it worked.
Added:

Chuck Season 2 Episode 20 Quotes

Casey: What do you call your move anyway
Chuck: What movie?
Casey: The girlie pose I saw you... what do you call that?
Chuck: The morgan
Sarah: The morgan?
Chuck: He invented in high school when girls were beating him up. You kinda duck a little bit.. protect the important.. face.. [points to private parts]

Congratulations, you now qualify for conjugal visits

Casey [to Chuck about marrying Jill]