2. Adjective. (poker) Of, pertaining to, or in the situation of first player to act on the first round of betting. ¹
3. Adjective. (obsolete military) Too close to be subject to artillery fire. ¹
4. Adverb. (poker) When in the situation of being the player who acts first in the first round of preflop betting. ¹
¹ Source: wiktionary.com