It's when something is just so stank it's worse than tacky or nasty by themselves
"That girl was trying so hard to brag about her engagement ring, that shit was tack nasty"
To dry hump your friend as a joke, possibly while playing gay together.
Kids nowadays are " Tacking a homie ", That's pretty fucking gay
When nipples become erect either by the cold or excitement the girls are known as Smuggling Tick Tacks
Wow it must be cold she is smuggling tick tacks.
A tower in the game series "Bloons TD" or "Bloons Tower Defense" that fires eight tacks in a volley but has short range against bloons.
"Tack Shooter is the best tower for me! I've being using it in Bloons TD 5 and in Bloons TD 6 and it's dominating every bloon!"
Plugging your shaboigaboing with something adhesive and nutting so it fills like a fleshy balloon. Pretty much cum cramps on another level
SIGMA: "Jayce told me he really enjoys tacking. He even did it last night. Maybe I should try it sometime!"
ALPHA: "Yeah, I think you'd like tacking too."
An unpleasant, sticky brown substance used to glue leaves, grit and grass clippings to the underside of someone's shoe. Like its blue-coloured namesake, it is most easily picked up, (sadly only by conscientious dog owners), by rolling another piece of brown-tack from the same pile over it. Dog dirt.
Hey, buddy, what's that smell? Dang, someone must have stood in some brown-tack!