with the head in front or bent forward; headforemost: He dived headfirst into the sea.
rashly; precipitately.

1820–30; head + first

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World English Dictionary
headfirst (ˈhɛdˈfɜːst)
adj, —adv
1.  with the head foremost; headlong: he fell headfirst
2.  rashly or carelessly

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The crew slips through a narrow horizontal slot on the side of the mine,
  crawling headfirst down a boulder-filled slope.
The toy knocked headfirst into the ceiling and came back down in pieces.
At the crack of the pistol, the contestants dived headfirst into the icy water.
If she tolerates his company, he will ply her with fresh fish, directing them
  headfirst into her beak.
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