"Sticky bombs" refers to explosive devices that have a sticky adhesive on them, allowing them to attach to surfaces like vehicles or objects. Full definition
Heck one mission had Trevor was burning up this entire hilly billy caravan settlement with sticky bombs when suddenly frames started developing and redeveloping on its own. (illgaming.net)
Sticky bombs made from lawn darts and dynamite; a plate launcher that propels crockery courtesy of a cement saw; or the byproduct of sticking nails onto a pair of MMA gloves, which births a weapon that makes Freddy Krueger's knife hands look like cuddly oven mitts... Blue Castle's crafting is wonderfully demented. (gamesradar.com)
You'll get bigger guns later on — including an incredibly pleasing, use - only - in - emergencies shotgun that pops heads like gory water balloons — but Seb also ends up with a rather nifty bow at his disposal, one that lets you deconstruct the many booby traps the game sets for you, and craft various different types of bolts which can freeze or shock enemies, or even produce ranged sticky bombs. (dealspwn.com)