noun
huge person; enormous object
Slangy, emphatic term for something or someone very large. Often used in casual speech or manga. Derived from でかい (huge) and 物 (thing/person).
あのデカブツ、本当にでかいな。
That huge guy is really big, isn't he.
こんなデカ物、どうやって運ぶんだ？
How are we supposed to carry such an enormous thing?
大物 means 'big shot' or 'important person', whereas デカ物 emphasizes physical size in a slangy way.
Compound of でかい (huge) and 物 (thing/person). This derivation.