When people speak by calling out each letter of many of the words in their conversation because young children are present for any number of reasons.
Mom: I want to tell you something but Chris is here.
Dad: Just use letter speak.
Mom: My D-A-D is going to G-E-T C-H-R-I-S a W-I-I for C-H-R-I-S-T-M-A-S.
Kid: What did mommy say daddy?
Dad: I can't tell you.