When two people (usually lesbian) are engaging in sexual activity, one will shove a twinky up the other's vagina while she is on her period. Then they both eat it, thus creating a Strawberry Shortcake.
Kelly: Last night me and Joanne had a Strawberry Shortcake...
The Glorious act of of delivering a rapid fire jab to the nasal cavity while receiving felatio from a member of the female sex. Upon ejaculation the concoction of blood and semen should make a strawberry like substance.
Overton's bitch was suckin' his cock that he had to reward her with a strawberry shortcake right to the face.