Almost as intense as holy guacamole but not quite. Like a “woah that’s pretty crazy” but not a “OMG THATS HELLA WACK” ya know? It can also be a short hand for holy guacamole
Brent: Hey man, did you how long the hw is?
Brock: Yeah bro holy guac Mrs. May really out here killin all these trees
A sentence to express your surprise about a situation or something somebody told you.
Friend:"dude I just won the lottery yesterday!"
Me: "Holy guac, no freaking way ma boy."