updog noun2 •A yoga pose in which the practitioner lies prone with the torso erect, supported by the arms, and the head tilted back.Mary Dunn recommends moving into a variation of Updog that teaches you what is necessary to avoid compressing the lower back in the pose. — 2003 •(humorous) A notional, ostensible substance; used to trick a victim into asking "What's updog?".Me: Hey, do you think it smells like updog in here?<P>Them: What's updog?<P>Me: Nothin', what's up with you?<P>*SLAP*<P>-Forbin — 2000 formsupdogs