What does it mean when someone ends a sentence with the word “Period”?

Ending a sentence with period indicates that the speaker feels that there is no further need for discussion and has said all there is to say on a subject.

Some Excerpts:

From TV shows, movies and novels

Desperate Housewives 

Nicollette Sheridan (Edie Britt) used the word “period” at the end of the sentence while talking to Teri Hatcher (Susan Mayer) in the popular TV show “Desperate Housewives” as shown below:

The Bold and the Beautiful 

Susan Flannery (Stephanie Douglas Forrester) used the word “period” while talking to Ashley Jones (Bridget Forrester) in the popular TV show “The Bold and the Beautiful” as shown below: 

24

Kiefer Sutherland (Jack Bauer) finished the sentence with period while talking to Dennis Haysbert (President David Palmer) in the popular TV show “24” as shown below: 

Prison Break

William Fichtner (Alexander Mahone) used the word “period” in the popular TV show “Prison Break” as shown below: 

Sex and the City

Cynthia Nixon(Miranda Hobbes) used the word “period” at the end of a sentence while with Sarah Jessica Parker(Carrie Bradshaw), Kim Cattrall(Samantha Jones) and Kristin Davis(Charlotte York) in “Sex and the City” as shown below:

Prison Break

Jodi Lyn O’Keefe (Susan B. Anthony) ended her sentence with period while talking to Chris Vance (James Whistler) in Season 3, Episode 13 of Prison Break as shown below:

Tags: 24, Ashley Jones, Cynthia Nixon, Desperate Housewives, Jack Bauer, Kiefer Sutherland, Kim Cattrall, Kristin Davis, Nicollette Sheridan, Sarah Jessica Parker, Sex & the City, Teri Hatcher, The Bold & the Beautiful