During a sexual act ejaculate into a woman's mouth. Immediately after ejaculating use your hand to cover her mouth restricting her from spitting. The reaction of not wanting to swallow the man juice will result in her cheeks swelling up like a squirrel.
She wouldn't swallow... so I gave her "squirrel cheeks"
by Tha Muzza December 19, 2006
When it appears that you have nuts in both sides of your cheeks.
Look mom, Kasey has squirrel cheeks.
by Sue Johnson August 02, 2006