The Collaborative International Dictionary of English v.0.48:
Rocket \Rock"et\, v. i. [imp. & p. p. Rocketed; p. pr. & vb. n. Rocketing.] (Sporting) To rise straight up; said of birds; usually in the present participle or as an adjective. [Eng.] [1913 Webster] An old cock pheasant came rocketing over me. --H. R. Haggard. [1913 Webster]