Possible Clues:

• Texter's "Hang on a sec"
• "Gimme a sec!"
• "Gimme one sec," in a text
• "gimme 1 sec bro"
• "Putting my phone down a sec"
• 'Gimme a sec'
• 'Just a sec,' in texts
• Texter's "Hold that thought"
• "One sec," in a text
• "I'll return very shortly," in texts